for me its one of the best new fps game out there!
the thing i liked most when i first played it, were that the environment can be destroyed with certain actions, for example grenades or RPGs. also the different types of gameplay, like driving jeeps and tanks or even uav helicopters!
although graphics quality is not everything in a game, it is also very important and this game really produced realistic textures that immerse you! Sometimes during the storyline, you'll find missions that are a bit tricky like the one descending the mountain in the snow, with cold weather effecting your health and can even kill you! I had to restart the level several times before realising the trick to do it!
Although I have not played a lot of multiplayer hours, I felt like it is a bit buggy, particularly when connecting to the servers. I think the multiplayer is the only part which i prefer in CODMW2.
All in all, those of you who are thinking whether or not to buy this game, i recommend to give it a chance, as it's the best modern warfare game out there!