If you look at some of the good movie critics (NY Times, New Yorker, Washington Post), their reviews don't operate on a scale at all. I don't see why the video game review has to be such a slave to the number rating.
In fact, it might help the medium in its quest for acceptance as a serious artform if the average game review didn't read like a checklist of the different elements in the game with an arbitrary number tacked on at the bottom.
Down with number ratings, I say.
Latest word from Midway is that the PS3 version is on track, but who really knows what that means. Given the third-party ports on the system and the UE troubles you mentioned, I would recommend sticking with the 360 version.
Of course, I don't even know when I would get to play this, with Bioshock, Halo 3, Heavenly Sword all coming soon.