First off let me say this question is being asked with the assumption that computer specs meet all the recommended specs for the game.
When I had purchased Black Ops from Steam for PC my computer went well beyond the recommended specs, but I had all sorts of problems occur such as crashes in the game causing it to force quit itself, as well as having the game screen go to a bright yellow and not returning to the game itself.
What are the differences between the various ports of the game?
Best Answer
There's a couple of really good comparison videos that have been done, but this article summarizes the differences and shows a bunch of different videos of different versions of the game.
If you're looking for a quick heads-up comparison of the video quality, check out this YouTube video: