Thought I'd throw out what worked for 2 of my friends:
In Deathmatch, pick a guy who is going to get the MVP (preferbly as a scout) and find a little out-of-way part of the map, then whomever is helping him (be it 1 person or several, preferably as Scientists) and meet up with himto let him kill you/you all. Respawn and repeat.
It work for my friends because while the other players were busy wasting time hunting each other down, we made a bee-line and each got the MVP/ended the match before anyone else could rack up enough kills.
(I say scout because the cloak can hide them from the occasional straggler and Scientists because they can cover a lot more ground.)