Yeah I'm not surprised to be honest.
I've enjoyed KZ but it does have a little weirdness to it that I can see why people may or may not get on with it. That being said a 5/10 score by Polygon... ok yeah.
Now I expect 1st party games to be judged more harshly than 3rd party games... just because companies are not going to want to give out high scores at the launch of a console generation... can you see the issues of giving 9/10 for games that might have needed a little longer in the oven..
Going to be interesting what they give to Zoo Tycoon, Ryse and DR3... because if the stuff thats been coming out about them is true, then we could be looking at 4-6 /10. Forza is my bet for the highest scoring game on the whole, but with the lack of content, suspect that will get 7/8's... anything higher will be a bit of a joke to be fair.
Did you notice that Flower and Resogun are the games with the highest scores 9's etc out of 10.
Fascinating times, but will be glad when its friday, so the messy end of console launch is out of the way...lol