The only places I've gotten "stuck" so far were where I knew where to go, but every time I'd try I'd get killed. I end up doing those sections a few times before finally getting through. Right now I'm in that situation with the stupid striders. I'm out of rockets, and I can see a crate of them up in a staircase, but if I try and get to it, I get taken out by the strider. Not stuck, just frustrated that I can't get to the rockets and take out the strider without dying.