I got Oblivion for the PC and it was lagging quite a bit. You wouldnt say that they're of any equivalency, would you?
Not at all. My old comp from early 2000 could run MW fine, but I had to play Oblivion 64 on that system. I would reccommend getting it off steam regardless.
Better yet, what are your computer stats? If it cam out any time after 06 it should be fine.