If you look at the comments lot of it talks about bad graphics or lack of innovation. Both of which many already expected.
As for the graphics, IGN said it best for MoH Warfighter:
I'll be honest, I've enjoyed every CoD singleplayer since CoD4 (I never played any prior to that). I've usually played beat through within a day or so straight because they draw me in and want to keep playing.
I've been reading good things from real people and not trolls on metacritic. It's not anything groundbreaking but it works at least and seems to be fairly bug free.
I never seen MoH Warfighter break 10,000 PC players online. Black Ops 2 MP already has seen a peak of 51,000 players on PC and Treyarch is already talking about patches to fix issues known and new.