Being a very long time 'Tallica fan, I would lie if I said their track wasn't the main reason I've got the album in the first place. However, as any other music lover, I did look forward at other music that could have been interesting. And it does appear on this tribute. Yo-Yo Ma's track was enjoyable, Fleming's track too, so were 3 new tracks Ennio threw in for the additional pleasure.
All in all, the album is interesting because it has a good vibe of appreciation of the maestro. Therefore, I would recommend it to anybody, who knows Ennio's work and to others beyond.
As of Metallica track. It is nothing of a surprise, because the original song is very well known, and the cover is the true Metallica cover. It sounds very fresh, with little nice guitar solo tweaks, it feels like the guys are in their 20's again, it is done with the same 'not-too-serious' attitude as Garage days where done back in 87. It made me feel good, and that's what matters.
It'd be logical if they will play the concert intro themselves for these few Europe shows they have this summer, and I hope to see that happen, since I got the Vienna gig tickets already through the Metclub, hope to get Moscow ones too.
Take care and enjoy.