Due to the several thousands of games, coming up with a list gets pretty hard. And not to mention, it gets even weirder figuring out which games don't run well because it's MameOx or which games just don't run well in any Mame in the first place (which is a lot)
But again dude, you're kind of in the wrong place. Do you even check out the emulator forums at
http://forums.xbox-scene.com ? I must've told you about that place a couple dozen times.. Digitalpress forums isn't exactly the spot to get loads of xbox emulator info :P And if I recall correctly there are a couple of threads over there specifically about MameOx compatibility (Mortal Kombat for example works better on some versions of MameOx than others)