Picked this up a few weeks back thanks to the EA Store vouchers, I'm actually very impressed. Vastly superior SP experience to COD:BO, and well worth the money:
-Looks good visually, I think the unreal engine suits those sort of environments
-Decent performance (60-150fps)
-After editing the .ini file the mouse movement feels good and certainly far better than COD:BO
-Decent weapons that feel satisfying to use
-Nice variety of stuff in addition to standard FPS fare i.e. vehicle sections, helicopters, fire missions etc (although most of those bits seem really easy)
-Some very good cutscenes such as landing in hot LZs
-Storyline just feels better than that ****ed up stuff in black ops, much better continuity at least
-Some nice set pieces such as the end of one mission where you are trying to defend an LZ against a large group advancing from the hills, terrain getting blown up around you, squad running low on ammo etc...
On the negative side, it's a bit overlinear in terms of blocking your route for no apparent reason, e.g. doors that can be easily kicked in but it only happens as part of a scripted sequence. Understandable from a gameplay mechanic perspective but it happens far too often and makes the game seem overly contrived. Also it could maybe benefit from more/better indicators on the HUD showing where you next objective is, sometimes your squadmate goes wandering off in the dark and you have to find him in order to progress the game.