Guitar Hero Metallica won't release until next Spring and will likely be made for World Tour and will therefore be far more superior to this release because it will include all instruments and voice.
The other thing you must consider is that Joe Perry is very riff heavy and IGN even stated that this caused the game to be much easier than they would have liked which caused the lower score. That won't be the case for Metallica, Hammond is basically a guitar God by comparison and hardly any of that release should be riffs on Expert settings. The thing I am worried about most in the Metallica release is having to play 5 minute solos and nearly 10 minute songs constantly.








