Maybe I'm just insane but I never considered GoW3 to be a looker except for the impressive scale of the boss fights. Like, people keep posting these close ups of Kratos and I just think "huh? UC games looked way better than that".
I think what did it for GoWIII is the insane IQ. But other than that, I agree, it didn't look way better that Uncharted 2/3, although to be fair I guess it should be compared to U1.