You don't have a body in most FPSs, other than Halo really. Modern warfare, counter strike (I know it's the same engine), even minecraft! I know that these aren't really story based games, but really, how much does it matter that you don't have a body? All I know is that wasn't what I was thinking about when I walked through Ravenholm, feeling some of the most intense suspense and tension I've felt in any game. For atmosphere and pacing, it excels. I think the immersion factor is pretty good. Also, with respect to the comment about "the HEV suit suddenly appearing on" is really because nobody wants to watch a character put on a spandex body suit in first person. It would be boring, and people would complain.