The lack of environment interaction in this game is a killer.
Goddamit when are they going to release an Ultima'ed FPS? I'm fucking tired of linear shooters where all doors are locked tight, all lights are fucking bulletproof, all NPCs are invincible, and the only way to get from A to B is to jump on the straight line railroad.
Seriously, this is 2007, almost 2008, and we're still playing Doom. And don't even get me started on scriptfest games like Half-Life, you can shove those physics puzzles right up Gabe Newell's ass.