I don't really blame Ubisoft for resorting to desperate gambits at DRM or avoiding the PC platform entirely due to piracy because, according to Escapist Magazine's own Shamus Young [http://www.escapistmagazine.com/articles/view/video-games/columns/experienced-points/7225-Piracy-Numbers], PC gamers generally are pirates. I'm not, but apparently that puts me in a minority.
That said, I'm less prone to forgive Ubisoft for releasing shoddy ports. Because, if you're going to release on a platform at all, it would be foolish to release it in a state that reflects poorly on your company. PC gamers are now looking at Ubisoft games as lemons, and will be less willing to pay much for them. Optimization isn't that expensive to do, so what a stupid way to run a company.
A more likely possibility is that Ubisoft is colluding with next-gen console manufacturers to water down the PC version deliberately so the XBone and PS4 would seem competitive. Of course, they're not going to say this publicly, because that would be absolutely unforgivable in the eyes of their consumers and do massive brand damage to all parties involved. Not this least of this being a confirmation that apparently the new generation of consoles are already obsolete to the PC.