I beat the game back in June, 3rd best game I have played this year behind TLOU:R and Destiny. I agree with the 8.5.
But above other very enjoyable titles I played like Tomb Raider, Infamous:SS, NFS:Rivals, AC:BF, and a handful of other titles I enjoyed.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut