Where do I start? Stutter, vram issues, crashes, freezes, black shadows, poor sli support, poor gpu utilization, outrageous specs. You name it, they do it. The biggest problem right now is stuttering (they have that in watch dogs and Far Cry 4). ACU is unplayable for me cuz it hard freezes in the exact same spot no matter what I do. Others can't even get past the first memory (at least I got half-way through the game before it broke). Go on steam and a ton of people can't even get Far Cry 4 to load. FC4 is almost as big of a disaster as Unity. People are talking about suing them cuz they can't even open the game, even after the patch that was supposed to fix it. I don't have the problem, but a lot of people do.
Ubisoft is

They can't optimize for shyt and all their games are broken. Buying their games was like throwing money down the drain. I lost for preording (I love AC and FC though, so I thought it would be worth it). I'm boycotting ubi for the time being. Their games have to work 100% before I buy another one. If they keep doing what they've been doing, then they probably lost my business for good. I hate that company!