Seriously Polygon's opinion of the game, is just that opinion. I can't figure why people get so worked up about reviews.
Over the years the publication that seem to resonate with my views the most is EDGE, that not to say I would buy a game they rate lower, I would and have.
I never really read Polygon, so their reviews are pretty much meaningless to me.
Mainly because opinions by people with influence can drive people away from what otherwise is a great series. Sadly it's reasons like this that a racing game will pretty much never be GOTY.
Honestly the craziest thing about the review is the idea that the game isn't difficult. I've been playing Forza since the first game and racing against AI ln unbeatable is some of the toughest racing I've done in a racing game. Turn off all the assists, turn on simulation damage, manual with clutch, turn off the racing line and all your HUD and drive in cockpit only and tell me this game isn't difficult....