Parts of CoD4 are better than this. Even if they are scripted and only walk from point A to point B, the AI, for instance, is far better in CoD4.
COD4 is no where near as good a Crysis IMO this is the best FPS in years.
I love the big levels and the choice to approach enemy's in different ways, yes the AI can be lack luster but the destructible environments, attention to detail and of coarse the graphics make this my choice for GOTY.