I've played the first couple of levels thus far and must say that I am inclined to say that this is a really great game. The engine is the old one but it's leaped in looks much more than in previous game changes (MW>>WAW>>MW2 those leaps were not as huge as MW2>>BO is) and it's gotten great. Especially owners of older rigs will like that. The story is intriguing. Since I don't really care about sound (I am musically not that sophisticated - 2.0 is enough for me sometimes :D ), no comments there. Gameplay is classic and seeing those oldschool M16+M203 rifles, M16A1's w/ 20 round clips - just sweet (the AK has too small of a rebound, but still ok).
I don't really know why HWhunter doesn't like it (I guess it's personal preference - I mean I just freakin hate World of Warcraft for which some people could stab me in the face or something - it's just relative - this action-movie arcade style military shooter ain't your thing, as it seems). There isn't anything better out there in this niche (MoH was more than OK, but still it doesn't go as far as CoD does in terms of gameplay-quality/action). I hate to know that the SP campaign's gonna be short as hell, cause I don't give much about MP, but still the franchise is cool and I hope they won't stop making these games.