3D isn't (Though with the exception of Sunshine, it is), but 2D is. Hell I picked up New Super Mario Bros. 2, it's the same bumping game I've been playing since I was 4. Hell Super Mario World is a better game.
Oh your complaining about "New" Super Mario Bros, carry on then.
I also agree that Super Mario World is a better game than any of the "New" Super Mario Bros lol.