I had the exact same experience with AC3. I'd be willing to bet money that it would download another patch if I attempted to play it right now.2. Assassin's Creed brotherhood. Now bear in mind I picked this up on a Uplay sale after I beat black flag due to having nostalgia for playing it on PS3 (I. E. Years after all parches were out.) I try and start it and it says it needs an update (after I just bought and downloaded it in the Uplay client.) let that go, launch the game... And it's a buggy mess that runs like garbage and crashes 20 mins in. Try to start it again. Says it needs another patch. Slight improvement, lasts an hour until it crashes. In the end I had to boot it and close it nine times before it incrementally installed all the patches. This, may I remind you is for a game published and developed by them, bought and installed through the client they built. That put me off ever wanting to use Uplay again.
I don't buy PC games that use Uplay anymore.