I'm pretty sure you will on bc games like halo2. The 360 would just have better rendering (no popping up textures) and a sharper picture (because of HD and more antialiasing). You won't have any advantage, unless you call being able to change your granade types etc on halo2 with the shoulder buttons instead of the misplaced black and white buttons. Also, because of the better wuality picture (sharper and more detailed) when using an hd tv, your opponents will look clearer from a distance, but that doesn't mean you will be able to look past the fog of war (renderline) or whatever you wanna call it.