I'd say I'm anywhere between 6-8, with just a smattering of 9. Dragonforce, Rhapsody of Fire, Powerglove, those are all fine and good. Mostly 6 or 7, with just a few individual songs touching 8. Meanwhile...
I know this isn't the hardestcore metal, but as far as sheer headbanging potential, I like to think this is godly amazing.
Also:
That's the smattering of 9.
Also:
That's the smattering of 9.