I've played about 4 hours so far. The PC version is excellent, and it isn't a port. PC was the lead development platform.
Not sure if serious.
The game is loaded with radial menus that are pretty obnoxious on PC. It is a good port overall, but it is still a port, you can feel it. I do give props to Ubisoft, though, as the interface is still fairly easy to use on PC after you adjust. There are also a lot of graphics options which are normally overlooked.
The game itself is fun, though some of the mini-games feel like afterthoughts that weren't fully developed, but the multiplayer is interesting and challenging. It even gives you multiplayer pop-ups from time to time when it notices you aren't doing anything particularly important.
The biggest gripe I have about the game is driving, in which a single press of the forward button results in your character slamming the petal down. Driving is well done other than that, since I can feel they put more effort into realistic car physics rather than arcade racing cars.