OMFG FORZA SIX IS TEH AMAZEBALLS :D
Forget how pretty it looks (it's VERY pretty), and forget the number of cars (far too many IMHO), and forget that we have a sensible number of tracks this time (Brands, yay!). Forget all that. Instead, bask in the incredible feedback from the controllers.
I have never, ever, EVER played any game with feedback this good. I played the demo with the controller, and the haptic feedback on the triggers is just so impressive, much better than F5 ever was and that was pretty darn good. However, get yourself a wheel, and this steps up another level. A massive level. Even on the opening bit as the Ford GT, when I came to the first couple of corners and had no idea where the track went so was going miles too fast, as I turned the wheel the instant understeer was as close to real life as I've ever got. I physically exclaimed in excitement at this, it's just absolutely perfect in terms of feel. This game demands a wheel, it really does. Oversteer seems to be more catchable as well, as long as you're quick enough with the wheel which you actually can be now.
I've not even touched the settings, and it's perfect out of the box. PCars may have a billion options, but it's p*ss poor after this. It's utterly amazing. If you like cars at all, you should be getting an Xbone + wheel just for this. Motoring nirvana.