Yeah it is a good game. The multiplayer runs on a different engine (frostbite) than the campaign (modded unreal 3) but I still like the multiplayer a lot. It is a nice change of pace from the hacktastic COD.
Definitely a lot of realism to it although you cannot go prone. Main reason being is that if you could, with the detail that is in the maps, you would never be seen.
I like it but will still buy COD for zombies and gun game when that comes out