I don't think Black Ops is very good. Haven't played it yet, but from what I understand, you don't even fight a mountain in the game. Lair > Black Ops. Some good suggestions already. If it doesn't have to be a strict shooter, then something like Deus Ex is an awesome choice. Thief games are good. Fallout 3 is sort of shooter-ish, although mostly RPG. I've been really behind on semi-recent PC shooters though, so can't really recommend too much. Still need to check our the FEAR games, Stalker, Borderlands, and a few others (though some of these might be a bit too new).
