I got a Batman AC code from a new graphics card I bought. It's fun, but runs like absolute crap randomly on my machine. Which, as you can see from my sig, should be able to handle it pretty well.
So, just a heads up on that.. I know there have been several performance patches, all of which I have, but the slowdown issues are still there sadly. Search around the net and you'll see what i'm referring to. It's 60+ fps for awhile, then randomly it stutters and drops to 10fps for 10 seconds. Really annoying.. I gave up on playing through the game because of those issues.