I don't know anything after the black album except "ain't my bitch" and "2x4", which were kind of average, not really standing out (to me at least). But I've been listening to Orion and Call of Ktulu over and over again since I became able to play MP3's on the car cd player... I loved those when I was a teenager (and more metallica songs then), and it's funny to be sort of getting back into them. I think the Black album was a maturing point for them. I started laughing when I came out of "Wherever I May Roam" into "Seek and Destroy". The differences are kinda funny. The audio quality seems distinctly better, not that it was bad before, and it seems like they're using better equipment and production there. The pre-black stuff has a lot of oomph and high quality, and you know they're not using low quality equipment, but there's something more honed about the black album. Maybe it's the writing coming across as production, but I think there are a few duds on the Black album, too. I'm not a Metallica fan anymore at all, and I really don't like the hawkish attitude they have, but the instrumentals are killer.