For metal... hmmm...
just so we can have a common ground... among all the Metallica albums, which one is your fav in terms of mix (not the songs)? My fav one is Load and Reload. I like their sound the best here (not my fav albums... but I like the over-all tonality here) ... better than St. Anger... although, I do like the St. Anger rehearsal recording way better than the finished one.
My fav rock album mixes are Van Halen - Carnal Knowledge and Aerosmith's Get a Grip.
I also like Disturbed's 10,000 fists album
**additional comment** Although I'm not fond of country music... they do have killer acoustic mixes. Man, it really shows off the tone and clarity of the guitars!