I wonder how long the game is going to let me stare at that flamethrower behind the security door before I can finally get to it. Quite a while I should think.
Yeah there are some technical weaknesses that get in the way of your complete enjoyment. Being glued to the floor like you said. I must have taken down 10 people with my wrench who all had handguns the model lying on the floor and I'm unable to pick it up. I also miss physics on small clutter, noise when I bump into something.
The save points are what create the tension. It would be gone with a quicksave and if detection wasn't hazardous, and in the case of the Alien, lethal. I think I would prefer autosaves though, I find myself backtracking just to reach a save point, which is pretty silly.