Nearly finished it, sad to say its no halo 3 :-(. The grenades are poo, they have gone down the cod route i feel. The game play just dosen't feel as smooth either and the story just seems a bit far fetched (even for a sci fi game).
My verdict is, a good game not the worst halo we have seen but def not the best.
(Also iv'e had some problems with cut scenes have no sound)