I put HoF only because Kill Em All, Ride the Lightening and Master of Puppets. All of there other albums where mostly filler. They were very good in the early mid 80's but then dropped off big time and became some of the snobby musicians around. They didn't invent Trash like people claim.. they just made it popular. Slayer, Exodus, Overkill and Venom were better and came first. But, Kill Em All, Ride the Lightening and MoP were so good they get HoF.
EDIT: Also since a song off one of their worse albums was posted I'll post what I think was there best.
When I think Metallica I think of this song.
I love this song, it's a lyrical juggernaut.
Kicking Mustaine out was the biggest mistake they made.