For me Metallica and ACDC work because it's mostly blasting, adrenaline pumping rock and roll ( except for the couple lame Metallica tunes they put in there) that you're hearing. That's why Maiden would work too.
The Stones, while undeniably a great band, do not rock hard like ACDC and Metallica. Their pin sucked.
Kiss plays rock but not hard and heavy, more glammy. Haven't played KISS but I've heard things.
Aerosmith, especially for the last thirty years, has not rocked much at all in my opinion. More like radio pop that I usually switch away from. For me it's not good pinball playin' music. Plus I think there is way cooler art and imagery to draw from with the heavier bands. I don't really want to look at a photoshopped OR a hand drawn Steven Tyler. Much rather see hand drawn Eddie if we gotta get another music pin.

Heavy Metal Meltdown VE!

Any pinball theme based around evil stuff from hell is a winner in my book.

Just got a pro and wow, it's a great game and its a beautiful piece of art.
Only gripes have already been addressed in this thread: long delay when the ball smacks Jacky in the face when the toybox is closed, and the fact that the ball goes straight down the middle 75% of the time after bouncing off him. I think that whole deal with the ball launching at the closed toybox should be removed, personally. It doesn't really do anything for the game.
And the smart button, Ive had the game a week and played probably 60 games, only seen one smart missile and not sure how I earned it.
These minor gripes aside, I love the way the game plays and looking forward to the code update. Nice work Stern.