As somebody who barely plays the AC games and only knows a little about them, the Desmond sections in 3 look like shit. And not just the gameplay, graphically they look worse than the main game for some reason. Like, crappy character models/animations and no shadows. They must put some B teams on those parts of the game or something.
The rest of the game looks fine, but I've only seen a bit. Maybe a little janky in terms of the framerate. Ubi needs to start putting out games on the PC the same day as consoles already. Also new consoles would be nice, I guess.