I would love to seem some maps that are smaller, allowing more for that feel that was in the Singe Player game.
Instead of getting the rush of turning around an alley and coming face to face with your enemy, on multiplayer most of my time is trying to skirt the entire area so I can avoid all the snipers.
I would love to play a server that runs small, CQB maps. Or, a server that has snipers disabled. Just my opinion.