yep, i bought me a controller for my ps3 that resembles a xbox.. makes it alot easer to play any games. I cant stand having 2 sticks side by side with big fingers.
These guys in china make an adapter for a wired xbox controller to work with a PS3. I've got one and it works fine.
I dont remember the name, but its like 10 bucks on amazon.
Edit: I bought this one and it works great
Please keep in perspective that all these xbox this and ps3 that, better / worse, sucks / rocks comments are purely personal preference. As are my comments. I have both, have had both since they both came out. Both systems rock, both systems suck, both have things the others don't and anybody saying one is better than the other is just voicing their preference. Nothing more.
If you already have BO2 for ps3 you are not going to gain anything by buying another copy for xbox, other than another disc of course :-)