The probable sceairio is that this will be a better pin in some ways compared to ACDC because Stern will take all the good feedback from ACDC and use those good points, get rid of any points the market didnt like, and produce something that previous non music pinball peoples will now like in a pinny.
It will be like X Men, not a title/theme hugely great in itself, but a balanced and well thought out pinball machine which will get you to buy once u play it and see how good a player it is. At the same time Stern is ratcheting up its designs and toys n level of fun/features. How can the public not like all of this.
If Metallica is a well thought out John Borg design, wrapped around another music theme, it should do really well, plus these are Stern titles that can be sited n pull coin.
It wouldnt surprise me if Stern does a string of different music pins and cashes in on the demand and popularity. Exciting times.