Suddenly, the Double-Barrelled Shotgun appears to be in a pretty useless place (on the top of the well, which only one spawn location can reach). If that isn't bad enough, the Rocket Launcher is beside a hole that can easily be fallen into during heated combat (Aka the reason why Singleplayer levels could never work as Deathmatch levels if it wasn't for Noexit, which I am personally not a fan of due to it feeling cheap).
There is a Grenade Launcher and a Nailgun added to this linear map (never make a Deathmatch level a linear map), basically by adding the appropriate weapon near the ammo. Well, at least the Quad and Rocket Launcher are far enough apart to make mobility necessary to remain in control. Of course, the ramps only have one route and can make for easy kills if someone has a Rocket Launcher. A Double-Barrelled Shotgun stinks at long range, a regular Nailgun is weak (why didn't they do a Super Nailgun?), and a Grenade Launcher can't bounce high enough to hit the top. Basically, you can rack up a ton of kills if you just stay on top of the podium (and don't do something stupid like fall in a hole).