I myself haven't played Unity much, but I understand the problems the number of glitches it has and how it frustrates people. That aside, I hear the story is decent, and isn't anything 'bad' like AC3 was. If I do finish Unity soon, I'll also change my mind and get Rogue from last-gen. The reviews I've read of it say it's really good, so I'll give it the benefit of the doubt.