Sound — 10
One of the best bands to come out of the '80s, Metallica's sound is usually pretty much just a straight forward assault of speed heavy metal. But the defenition of '80s thrash/speed metal is defined best on this album, with songs like Battery and Damage, Inc. Really, the sound of the album isn't varied much throughout, a lot of amazing solos and power chord arrangements, but you'll find a very different song in Orion. Driven by a catchy bass line and some prog/rock like guitar solos, it really adds atmosphere to the album.
Lyrics — 10
The lyrics are beyond top notch on this album, the whole loose based concept of the album flows extra well. Some of the best lyrics come from the songs Master of Puppets, Welcome Home (Sanitarium), Disposable Heroes and Leper Messiah. The subject of the lyrics can range from drug addiction to religious power control and aggression. And of course, the lyrics fit the music perfectly, just take Battery for example. Not too many songs can get me pumped up yet when you think 'bout it and take a look at the lyrics, you'll see how the music fits the lyrics. As far as the singer goes, well, Hetfield does the job but nothing more, not a great singer, but not bad at all either, or atleast I think so.
Overall Impression — 10
So far I'd say it's Metallica in their prime and their best album in their discography. All the songs as a whole are impressive which make the album much more enjoyable all the way through. Although, I wouldn't recommend this album to people looking into geting into this band rather I'd rather reccomend Ride The Lightning (Previous album before MoP) because at times MoP can get a tad repetitive and at even at times a bit fast for the occasional listener. All in all classic album, just don't see albums released like this anymore.