Wanna smash my controller against my head right now. Give it to Fear to take a simple and fundamental game mechanic and somehow fuck it up.
Crouch. Its easy. Its important. Its in every game that involves guns. You press a button, you get shorter. Its that simple. It does not require innovation. The most change it's recieved is a trigger method instead of a button method, and its a much better system, in my opinion, but Fear went and applied the same basic idea of the trigger system... to a button press.
Let me put that in context. Your being shot at. Theres a sniper. You need to get low and cover some of your angles. You run into a small room, and instinctually press the Crouch button. Its ingrained in gamers muscle memory. But instead of getting on one knee, you throw yourself against the nearest wall, totally exposing yourself to the sniper. You try to move away, but you instead lean around to stick your head out the window. You press crouch again to pull away from the wall, and end up standing with your head in complete sight. By now, you've eaten half a lead quarry, the sniper is looking at you, so you run to the centre of the room to be able to actually crouch. Whoops! There was a doorframe there! You must have wanted to stick to that, right?
Your dead, and its definitely not the games fault. At all. Really. FTG