Which Metallica Album Is The Best? [POLL]

A few days ago, I ran across a video of some dude hearing Metallica for the first time. He was loving it. Particularly, as a hip hop fan, he really loved St. Anger - AKA - the only album Metallica doesn't mix into a live concert... Got me thinking, with so many different versions of Metallica as a whole, ten albums in five different eras of rock, which is your favorite?