In review scores, a 6 or 7 is average, or more good than bad. Sometimes people like to say a 5 is average because it is half way between 0 and 10 - but that's not the case. A 5 would mean there are equal parts bad and good. "Average" games should still have more good than bad, and thus should score a 6 or 7. 8's and 9's mean almost everything is good about the game while a 10 would say there is nothing that you would reasonably improve at this time.
So a 7 would be a "bad" review when you are Retro since almost everything about the game should be good. I suspect it's just a reviewer looking for a little attention, or one who isn't a fan of the genre. Everything I've seen about the game looks high-end. Of course, I need to play it first.
