Never been a huge metal fan, but I don't think I like it as much as their older work, based on what I've heard at least. I listened to 2 of the previously released tracks, as well as a bit of another one, and I have to say I didn't love it.
Sure, it's some of the best stuff they've done in years, but the one dong that I kept hearing was the "proof" that Metallica had returned, My Apocalypse, sounded more like a demo to me. The song had no energy at all.
I don't know. I'm willing to be proven otherwise, but I think Metallica's time is up.