What kind of multiplayer modes would you guys like to see in the next doom game? My picks would be deathmatch/ffa, team deathmatch, coop survival (mode similar to L4D/cod zombie) and possibly team objective.

Deathmatch, Team Deathmatch, and Co-Op for the classic Doom feel.

Also possibly a Versus mode, where two teams play the game on the same map while facing off against both eachother and enemy monsters.