I have six Metallica albums. I'd probably rate them something like this:
1. Kill Em All
2. Master of Puppets
3. Ride the Lightning
4. Metallica
5. ...and Justice for All
6. Death Magnetic
To be honest, I didn't really give Death Magnetic that many listens. I only bought it because I saw it go for next to nothing in the discount bin.
I have actually heard Load and I quite liked it. Different sounding band, but the music was okay. Never heard Re-Load or St. Anger.... apart from some radio play singles and stuff.