In all honesty, the best games I've played from Ubi are AC 2 and Far Cry Blood Dragon. I'll give a slight nod to Brotherhood and even Revelations for at least having an interesting protagonist. I never played Far Cry 3 but from what I heard Blood Dragon is more fun.
AC 3 was crap. Black Flag and Watch Dogs have plenty to do to keep you busy but it's all monotonous after a few times. All of their recent games have a watch tower to unlock more of the map with instructional simon says text pop ups that hold your hand from start to finish. Go here, kill this guy, etc, etc.
And now Ubi seems to be on a 'lets integrate single player with multiplayer' tip forcing to use they're DRM crap, Uplay. Numerous threads have popped in Ubi forums complaining about how broken Online Invasions are for Watch Dogs and they're right. NPC's are static robots who die from one hit no matter where you shoot them. No mission replay or re spawning criminal convoy missions and gang hideouts.
Ubi is ignoring these valid complaints and is focused on DLC and getting you hyped for upcoming sequels which will all most likely be more shit painted in gold.They need to slow down with rushing games out the door and focus on making games feel complete and polished.