Playing Riddick for the first time, back when it came out, made me actively realise what I unconsciously thought for a long time was something wrong with most (if not all) first person shooters up to that point: it made you feel like you were part of a breathing, living body. I love half life, and from the videos I gather that I would most definitely love the sequel as well; yet something that they still get wrong, no matter how immersive the environment, is the physicality of the first person perspective. In Half Life in particular you mostly feel as if you are a floating camera with an arm attached underneath. The reason I've always preferred a third person perspective in general is that it made you feel your character much more (visually), while the way the first person view is handled in Half Life and most games like it, for me, results in a feeling of being disconnected from the game world. Having the rest of you body be visible is one part of the solution, of course, but really what did it in Riddick was the way the camera animated according to the way the head would move in a given situation. In that regard, the recent Bioshock trailer really showcased to me how great a first person perspective could be if pushed far enough: too bad though that the in-game stuff I have seen so far doesn't point in a direction that would suggest the same level of immersion.