My favorite Metallica songs used to be stuff like Nothing Else Matters, Enter Sandman, ..And Justice For All, and all the other stuff with cool riRAB that's fun to learn on the guitar. But now, that new song that's out, "The Day that Never Comes", is not only fun on the guitar, but the vocals are the best I've ever heard coming from that man. The song corabines the best vocals of Metallica with guitar as complex and beautiful as Classical Gas.
This is just my opinion, I don't knw if anybody else agrees with me.