Their album Ride The Lightning is a masterpiece. The only real difference between Metallica of today and AC/DC throughout the years is, Metallica sold it's soul to the record companies and music execs after spending a better part of their earlier years underground building up a huge fan following.
Master of Puppets is one of those CDs which have earned a perminant place in my 6 disc changer. The other is Burnt Offerings. They both only have 8 songs on them though.