"MW:2>>>>black ops, simply because treyarch's engine's are terrible. thanks to I.D. the engine in MW:1&2 feels amazing."
Modern Warfare 2 uses the same engine as Black Ops. As does Modern Warfare 1, as does World At War. They all use the same engine, but have different modifications. And id Software had nothing to do with MW1 & 2 - they were made by Infinity Ward.
Modern Combat does exist on 360 in the form of Battlefield 2: Modern Combat. Maybe that's where the confusion came in?