7 and 8s are good... 5 or 6s are average scores. People are spoiled now a days if a game is a 7 or 8 nope not worth full price.
I agree that it is the way it should be:
1-2: miserable failure, broken.
3-4: Bad game all around with few redeeming qualities
5-6: Average, might appeal to some.
7-8: Good game, most people will really enjoy it. Possible GotY contender in an average year.
9: Excellent, a classic. Definite GOTY contender.
10: GoaT contender
But the unfortunate reality it seems this past few years has been:
1-4: Miserable experience, a complete failure, utterly broken game and just awfull. Should be erased from existence.
5-6: Terrible game.
7: Bad, but some might find a few aspects appealing
8: Average, not good but not horrible either.
9: Good game, with some excellent parts.
10: Excellent game all around, possible Goty.
It's pretty much a 7 to 10 scale, 7 tending to be "bad", and 10 excellent, with 8 and 9's being expected for AAA these days.