Frayed is and always will be my favorite. How much darker can you get than a constantly repeated tritone for a main riff? I like much of the interludes or bridges (whatever they are).
James' solo on To Live is to Die is probably my favorite moment on the entire album, but that song as a whole is not my favorite.
The title track is good, but too long. Blackened is amazing and the solo Kirk had on that track, might be his best.
After buying MOP on vinyl for myself, I recall a friend let me borrow 2 tapes not long after----KEA and Justice!
At first I said, are you sure this is the same band? They traveled 1000 miles in 5 years.
Harvester of Sorrow was probably the 2nd Metallica song I ever heard (on the radio, just part of it, but enough to know it was good!). It's probably my overall fave, and doesn't ramble too long.
Love the intro especially to the song ...And Justice also. It makes me think of being on the edge of starting something great, a great journey maybe......it's majestic. Works extremely well in concert also.