Overrun - just plain bad corpser vs cole , corpser wins every times.. Oh but frank its team based, NO. you solo que no one uses their mic and the ones that do don't compromise. Waste of time gametype, try it once to see what its like then no more.
Free For All - Just why have this over execution/warzone. Straight grenades blowing up everywhere people just shooting each other blindly with no coordination. Takes no skill to win just be at right place at right time.
Domination - Kinda fun, but there is always people who don't even care about objective and just run around run and gun style. Really no point to have a gametype if no one actually cares about the objective.
Team Deathmatch - Why change it? It was actually fun in gears 3. No its first to 50 kills? and now the bad kids on your team will drag you down even more. Also when it comes to the last few kills they don't stop your respawns. So if the kill count is 49 to 47 and your team needs 3 and theres 1, you get it. They kid with 15 deaths will cause the loss then my causing the win going 24 kills, 5 deaths.