The last good COD game ever made
This is the pinnacle of the COD franchise. The best of the best. After this WaW and Black Ops and MW3 are just cookie cutter copies that don't push the series forward much. This game uses a heavily modified id3 (quake 3 game engine) which is actually OLDER than 2004's Doom3 (which uses id4 tech, Rage uses id5). This game pushes the engine to its fullest. Sadly, WaW, Black Ops, and MW3 also use same engine, and dont push the graphics forward at all, in many cases backwards, the textures in Black Ops were very inferior to the MW games.
So there it is a little opinion, a little fact.