I laughed at what happened to ACII for PC. Mainly because you have to have a permanent connection at all times just to play it. Then some hackers messed up the server, so the legit players couldn't play for some time. Good thing was that Ubisoft is giving a free game to those that suffered.
What's different besides the graphics (of course PC wins in graphics most of the time)?
EDIT - A quick Google told me it's just a slight graphics increase, and the 2 DLC for free.
Doesn't really affect me since I don't really care about graphics, and I only paid $40 for my PS3 version, and the DLC is $7, so it's a total of $47. Still cheaper than the PC version.