After playing for a few hours on two of the three modes of play (multiplayer and campaign, haven't tried spec-ops yet), I would have to give it a 8.5/10. They did an excellent job with the graphics (mostly lighting and textures), gameplay mechanics are extremely good, AI is a little weak (even on Veteran) but fun to engage, multiplayer seems to be ok but a little too similar to MW2 (haven't played Black Ops to compare to), and the perk system seems to have improved. So far, i am really enjoying the story in the campaign, but with the release of Skyrim and CEA, time is a little hard to come by. One very good positive point to make, on my receipt from Gamestop I have a guaranteed trade-in price if traded before Jan 7, 2012.
All in all, very good game and i would definately reccommend. Two thumbs-up !! Remember folks, it's not Halo and does not compare so please keep that in mind!