Original post would have helped more if he had also mentioned the game in question.
I have bought Anno 2070 back in november, and have only once had trouble with not being able to connect. However I could still play it, and halfway through my session it logged me back in to uplay. Sure it's not the best service around, but as far as I can tell they are already on the retreat from what they were doing with Assassins creed, where you had to had a permanent connection, and as soon as your internet dropped you were f*****.
But I would like to go further in defending Ubisoft. They have actually learnt what internet DRM can be good for, because by being connected to Uplay you actually get bonus stuff that you can't get when you're offline, so you actually get something in return this time for getting the real thing instead of going ARRRRRRR and using a torrent (AKA piracy).
My previous game from ubi was From Dust, and that was horrible on multiple levels. The mentioned DRM was much more irritating (they did remove the most restrictive part in the first patch, just days after launch...), and it was just a mediocre game in general. But Ubi is learning, and going "omg I bought a game, had a bad experiance and you should all never buy from them again" is not enough information to make me stop buying.