Heard it sucked really bad.
ive seen reviews with generally poor reviews but YT gamer reviews generally saying its mediocre. the biggest gripe is the UI and not being able to join specific battle buddies.
also the biggest innovation that i've noticed a lot of professional reviewrs downplay is the buddy system. i think, and ive heard on videos, that it's a very good dynamic that really changes the game up.
my own conclusion without actually having played the game is that it just needs a few touchups before it can really become a good, not great, fps game.
I'd rather get Halo 4 and play on my bros Xbox though. 9.8 from IGN.