Master of Puppets was/is a very good album. It opened up a lot of musical ideas for heavy/thrash/bands, and probably others. It was a very influential metal album. However, influential does NOT mean good/great. In being honest and of course this being my opinion, the songwriting was good, not phenominal. The vocals are average. And the musicianship also average. Strong rythm guitar work, good bass playing, but here for me it gets weak, the drumming for a "huge" metal band at the time is just fuckin' below average. Listen to the album again, Ulrich could have been more creative in his fills and rolls. Hammet displays a decent talent on guitar, but completely over uses the "whammy bar" on this. Decent leads at times, but IMO, uses the bar to cover up his inadequacies as a real player. All that said, I still listen to it every now and then. In 1984 "MOP" was a shot in the arm. People wanted metal to be muscular and thick, and this album succeeded in doing that. People stood up and took notice. "Ride the Lightening" was a better album musically.