Just some quick feedback on the camera
1) I'm finding having the middle mouse button bound for rotation to be quite fiddly when the mouse is primarily for move/look/shoot etc. It would be beneficial to let us re-bind this key, but also add in options for manual controls for rotation so that you can use your other hand and keys (so using A and D for example) to rotate the camera left and right.
2) Depending on the camera angle, moving through doorways often finds you blind to what's in front of you, meaning you charge in to rooms without really knowing what's coming up. You can often find a camera angle that mitigates this problem but as in my point above this is fiddly and often slows the pace of the game down. Could the fade out on door frames be set from further away perhaps?