In the sequence with that "Bourbon" guy or whatever his name is, I can never get out of the falling subway car before it falls into the water/toxic shit. I get stuck in the door. It's pissing me off. Are you supposed to crouch to get through the door, because I tried that and it didn't work.

Also, the guns feel kind of unsatisfying. :( I really want to like this game, but I might end up never playing it through.

Is this when you are crossing the bridge?

As for the guns, that is sort of the point with them being reflective of a post-apocalyptic world. The bullets aren't very good. If you use the military grade bullets you get the effect of most other shooters, but those are also your currency. They are illustrating the idea that in the future you don't have the efficiency in the bullets. If you are having too much trouble with the gunplay just drop the game to easy.