You people that don't have widescreen monitors or TV's can't understand what a big deal this is. Gaming in proper widescreen is totally awesome, but gaming in improper widescreen is worse then no widescreen at all.

In fact, in my opinion, it's better to play in a streched 4:3 at non-native resolution then it is to play a game vert-. The "zoom" result of vert- is incredibally annoying, and like someone mentioned it can muddy up textures (I haven't noticed that in Bioshock really, but I haven't played much yet).