There is nothing wrong with this game. I played it, enjoyed it, and really thought it was good. I think an eight is suitable, because really, what has this game done that no other FPS has done. This is Xbox's highlight, as Goldeneye was for N64.
PROs
.Its FPS, what else do you need?
.The visuals are absolutely stunning
.The game (whether single or multi player) is specatular
CONs
.Its not revolutionary, I've done this all before