" I know you did it not too long ago but AC: Brotherhood was great to watch. Also if you go back and play Halo 3 with action sack playlist you get a load of crazy variants that are really fun to play. "Thats a great idea. Halo gets really crazy when you start to bring forge maps and custom game types into the mix.
Some other ideas...
- AC: Brotherhood was awesome.
- I find 3rd person games more compelling to watch then FPSs so maybe something like Uncharted 2 or Gears of War 2.
- Left 4 Dead 2 verses.
- Try other RTSs like Dawn of War II.
- Monday Night Combat.
- Star Wars Battlefront II