I liked them up to the black album. Favorites are Master of Puppets and And Justice For All.
The last cd, even though I can listen to it, is just...not that good. They stretched the songs out way too far, and the sound quality sucks balls.
And I used to think Lars was considered a great drummer, until some friends told me he's very overrated and really isn't that good.
Either way, they do put on a great live show. Saw them twice, one show I had decent seats and they were with Godsmack, that was a great show.