Gamespot gives a Graphics comparison between the most recent Call of Duty games, from Call of Duty 4 till Call of Duty Black Ops that includes: Call of Duty 4, COD World at War, COD Modern Warfare 2, COD Black Ops
MW2 Wins hands down!
they have similar engine but the shadows in Black Ops are much smoother
N4G is a community of gamers posting and discussing the latest game news. It’s part of NewsBoiler, a network of social news sites covering today’s pop culture.