Well there is pretty much no difference between console games and PC games now except graphics and keyboard & mouse. If you are just going to ask about every game if its the same, then pretty much. The only difference in BF3 would be online with more players.
I can't really think of much PC exclusive games that are any good maybe Civ, Football Manager, Half-life, MMORPGs and some other games that I am forgetting, if you want some really good games that you haven't already played on Xbox you will just either have to look through steam and see what catches your eye or tell us what you have played which seems like it could take a while.