AC Black Flag PC was the first Ubisoft game that i couldn't easily max out. I had to mess with the setting to get a good performance, which still looked INCREDIBLE! I think the Trials games' problem was something weird where that worked fine on Amd cards but not on Nvidia. But generally i really haven't had too many problem's with ubisoft games. People seem to be blowing the issue out of proportion. I think people are just bitter about Uplay. (and people should channel all that outrage to Games for Windows Live shutting downing and permanently breaking dozens of games).
FYI: I got my computer in July 2010 for $1100 and upgraded its video card in January 2011 spending another $400.