I haven't played FEAR2 yet, but from reviews, the environment seems to be lacking detail just like the first. That's what put me off most in FEAR1 as everything looked boxy and lifeless. Although the AI was decent, the scary bits were just shock moments: heartstopping for a second but never prolonged heartrate-increasing stuff - the final fight was the only exception to that.
The trailer seems to be a mixture of CGI and live video, with minimal in-game action, so I'm not sure if it's what the game will actually look like. The live action looked a bit more detailed, at least