I personally give the Millennium Force an 8. It has some airtime at the end, bunny hops, really. To answer the question of what inverted really is, I did some research and found some interesting facts:
Inverted: Upside-Down IE: Raptor
Suspended: Under-the-track IE: Iron Dragon
Out-and-Back: IE: the obvious: Magnum
Millennium Force has NEARLY INVERTED TURNS, they are not inverted 100%, otherwise you would think there would be shoulder straps. Oh, I really think that the way the lap bar is designed you really don't get that falling out of your seat feeling, do you?
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MattGould