NOTE: The game already provides you with a map before the match starts so I will just provide tips.
Checkout - combat usually finds its way over to the heavy weapon and power weapon (digger/Longshot) areas. I usually recommend going for the power weapon first. Most people head towards the mulcher but the mulcher doesn't really have the ability to affect the power weapon spawn. The reverse is not true. Both the Digger Launcher and Longshot can easily affect any battle by the Mulcher. Keep your eyes open by the Mulcher because the battles are usually fast, dynamic, and involve lots of shotguns. Either Lancer is viable here as well as either shotgun (though with a leaning towards sawed off).
Drydock - most of the combat takes place up on the high ground. Some people then think it's a smart idea to go through the middle to try and flank the other team but this usually ends in disaster. Try and take one side and then cross there to flank from behind or cross the bridge to quickly aid teammates. Always be sure to use the height advantage to keep the enemy from flanking you. I highly recommend Hammerburst to take advantage of height. Gnasher and sawed off are both useful on this map.
Gridlock - this map is pretty straight forward for the most part. Usually battles ensue by the Boomshot and Longshot area. I find the Boomshot to be more crucial because the Longshot, while in an elevated area, is largely exposed and is usually best used if brought to one of the corner elevated areas first. The boomshot on the other hand is usually instantly useful and far more mobile. And while getting caught up in all that, don't forget the grenades in the middle of the map. They are often ignored and can definitely swing a battle for one of the power weapons. This is a classic map and benefits pretty well from lancer and Gnasher.
Hotel - most battles take place inside the hotel. This is a map you can easily get by on with just your starting weapons. If you're looking for Gnasher combat then head inside, for longer range combat, head outside. Probably the safest spots on the map are the left and right corners out in front of the hotel. You only have to watch 90 degrees. However, that will generally be useful only towards the end. At the beginning, if you camp there then you're just taking a player out of the battle. I would recommend Hammerburst and Gnasher on this map.
Mercy - the fighting usually takes place in front of the Church or up by the mortar/OneShot spawn. A good portion of the map is wide open and lends itself to long range combat but the large foliage makes it easy for someone to flank you without you knowing. I would go with Hammerburst and Gnasher for this map. Gnasher for indoors and by the potted plants, Hammerburst for almost everything else.
Old Town - fighting tends to gravitate towards Boomshot side, particularly around the walled off parts on either side of the Boomshot. The Longshot is a useful weapon for up and down the corridors of the map but not as good across the middle as you might think. The Boomshot tends to be useful in both directions and is the more desirable weapon. This is definitely a Hammerburst map but the sawed off can be particularly useful on the sides of the map.
Overpass - on rounds with the Hammer of Dawn, fighting quickly moves towards the underside of Overpass but even with the Hammer of Dawn, this a map where elevation really shines. Take the top middle and you'll have a nice view of the map. Just make sure use your Smoke grenades to mark off the area so you know if someone is creeping up on your perch. This is also a great map for making use of spotting. Again, a Hammerburst map with a slight leaning towards the Gnasher. I would highly recommend this map for Horde. It's right up there with Trenches.
Sandbar - almost all of the combat takes place in the middle of the map. It's crucial to take and hold the top middle as best as you can. It spawns a Hammer of Dawn and another power weapon with only two access points, one on either side. Once you've got a hold on it, it provides you with a superb view of almost the entire map. Normally a Hammerburst and Gnasher work well but a sawed of can work wonders for both blocking off the entrances to the middle as well as breaking into it.
Thrashball - combat gets pretty evenly split up on this map. Under the Raven, you really need to be careful of planted grenades. Even if you manage to hold that area by planting grenades, you need to be cautious of the balcony area because the mortar can reach under the raven. For that reason, it might be better to go for the mortar first but you can usually pick up a kill or two in the Raven tunnels early as someone rushes for the grenades and gets trapped in the hallway. Stick with the Hammerburst and definitely the Gnasher on this map. A lot of points on this map are perfect for Gnasher combat.
Trenches - the Mortar spawn is always the first battle. On this map, it's the better weapon but it also has the worse position. It can reach anywhere on the map and is actually protected from the OneShot spawn by the hanging crate. But pretty much every path leads to that spot. The OneShot spawn is safer since everyone has to come directly up the hill at you however it is far less versatile. Try and get the mortar. If you fail, use the OneShot to provide support for taking the mortar. Hammerburst is pretty useful on this map and the sawed-off might be more useful than the Gnasher. This map is probably tied with Overpass for best Horde Map. Again, use the OneShot spawn.
Versus Map Pack
Blood Drive - battles on this map vary quite a bit but tend to be longer in range for most spots. Inside the buildings it gets a little close and you may benefit from a sawed-off however even indoors, with the exception of at the top of the stairs, the Gnasher is a stronger choice. Quite frequently, the battles will take place in a long space, even in buildings. Hammerburst is quite effective at shooting across from one set of stairs to the other but if you are going to play aggressively, the Lancer is better than Retro because you will frequently be shot at from the tops of the stairs. Torque Bow and Sniper tend to be rushed and you need to watch out later in the match for grenades tagged to walls.
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Azura - most matches revolve around teams trying to make their way up to the power weapons on the balcony. A team that can get there and hold the position will keep a pretty good advantage. I would recommend going with a Lancer on this map however you can use either a gnasher or sawed-off on with a slight favor to the Gnasher for its better range. The center area around the fountain becomes home to some good medium range fire fights. Since these are so frequent, the lancer comes in handy unless you are on the balcony. There I would recommend the Hammerburst. Just make sure you watch behind you because this map can be kind of tricky with flanking techniques.
Rustlung - the Main attraction here is the Silverback which will be unleashed after a certain amount of time. After the time has elapsed, you'll see that there is a light in front of the Silverback lift. Hit the switch there and it will raise the Silverback for use during a normal versus match. There are mulchers on either side of the silverback so watch out while waiting. The fighting will generally work its way through the ship making for a normal match until this point, then a good number of people converge there. If you can be smart and flank just at that moment, you can bet that your teammates will be keeping the enemy busy. I would not go with the Hammerburst on this map. Lancer or retro are acceptable as well as Gnasher and Sawed off though I would lean towards Gnasher simply because there aren't too many high traffic spots for the sawed-off to benefit from.
Bullet Marsh - this is the Bullet Marsh we know and love (sort of). The map is largely the same except for the addition of the little village on one side of the bridge. I recommend heading up high because the bridge has a much better vantage point on this map. There are also the two longshots but these can be put out of the game if you break the generator near torque bow, meaning that it's not as suicidal to go for the Torque Bow now. This will put out the light and have kryll swarm around the Longshots. Thankfully, it seems much more difficult (if not impossible) to just stumble into the darkness and get eaten by Kryll.
Clocktower - this map is a little different because not all of the action focuses on the power weapon. The Longshot spawn at the top of the map can be useful but it's usually ignored. Most people head to the lower street area to fight and then, once resistance builds up on the other side, they head up top towards the longshot. At this point, they may go for the LongShot. The best option is usually to put three people on the lower level to fight in the streets while a two man team heads for the sniper. Then they can use it from that higher elevation (or even down low, behind their team). The tough part as that you going to be shot at from behind once someone comes for you. That's why you'll need a second person with you, to give you time to escape when the other team inevitably comes up.
