I agree it sounds completely amazing. I, too, was surprised to see every single reviewer thusfar claim the overall visuals of the game are on par with the best of any console. I'm glad that artwork still means more to reviewers than technical capability.
Personally, I think reviews 9 and above are AAA.
7.5 to 8.9 is very good.
6 to 7.4 is decent, and can be good depending on personal preferences.
Anything below a 6 is probably bad under most circumstances, and average at best.