I got my copy yesterday, and got about an hour in last night... and wow.

I hope the rest of the game keeps up this pace and balance.

Initial impressions are;
It looks great, they have done some good work again with the graphics. the Battle fields end up looking very chaotic with smoke trails from RPGs and fires from burning cars etc. The animations are very good as well.

The AI (particularly your squad) is very good, the audio cues you get from your squad are great (much as they were in COD2).

The maps I’m enjoying a lot. They are linier, but in a similar way to HL2, the maps sort of guide you in the right direction without forcing you down one singular path. So if you get pinned down, there is room in the level to flank the enemies, or get to a roof for better position, but as you move on you never find yourself on the wrong side of the level unsure where to go next. there is also a nice mix (so far) of locations. So far we have been on a boat, in a 'middle eastern city' and in the Russian county side.

Voice acting seems very good to.. its not to often that the English chars. sound like they are actually English, and not some horrible put on 'Jolly Ho Charlie lets get the blighters' accent.

anyway.. so far so good.