^^^ What Fletch said.
I think the main problem with DM though, is that everyone spawns with a (almost) full complement of weapons - too many grav guns and it's insanity - but add machine guns and grenades as well and no-one really stands a chance - its just all a bit random.....
Make the grav gun a prestige weapon, I say.
By all means make them relatively easy to pickup, but everybody spawning with gravs AND submachine guns AND grenades??? This effectively ensures that the 2 maps we have now are 100% Mongolian clusterfucks - so little skill is needed provided you know how to 'game the game' - e.g. by spamming grenades into populated areas /sitting with your back against the wall with a table in your (antigravity) hands.
I finished 75/11 against my housemate on lockdown yesterday but it got a bit boring about halfway through.....