Biosophilogical said:
Make it less shooty and more tactical. I mean, there is a big gaming difference between running through a maze of trenches trying to flush out enemy combatants, and well ... CoD. Add some capturable spawn points (the only purpose of which is as a place to spawn, not as a 'capture the flag' mission), make the levels more extensive and war-like ... so yeah, my suggestion to the melting pot is to move it away from a run-and-gun and more towards an actual battle.
This. Some people wish we would go back to the days of the Duke and leave military shooters... Well I wish they would make proper brown n bloom shooters, as it were. The Rainbow Six games are awesome. Even the newer Vegas games were great IMO. Go around one corner without looking - boom, dead. Storm one room without first analyzing the situation properly and positioning your team mates - boom, dead. Every move requires thought, patience and skill.
Maybe its just me, but sneaking into the the enemies base to find a nuke, killing only those you have to until you find yourself in a position that puts you right where you want to be to make up for your lack of men and then starting the proper firefight sounds like so much fun to me. More than kicking down the front door for some stupid slow motion shit and running along corridors all day.