Yeah, their early, Metallica stuff is great for sure... But I'm glad they've evolved to the point where they can release a full album of original songs. Their newer albums have such a nice blend of proggy metal, classical cello, and rock w/ vocals. Some people have said they've become too commercial, but I think they've chosen some great singers to work with while maintaining a very unique sound.
And on a different note, their version of Hall of the Mountain King is AMAZING.