worst sounding great lps

I have found that some pressings are far better than others on some of the records mentioned.
The first four Sabbath records on UK Vertigo Swirl are very impressive sounding (Vol 4 is the least good sounding in my estimation- not talking about the music, but the sonics).
Aqualung- agree it is basically a lousy recording. I do have the single sided Classic 45s on Clarity. My go-to, however, is a WLP Reprise, which is far easier to find and cheaper.
Zep- yeah, too bad, huh. I've got a lot of different pressings and the best ones one get you to subpar sound:
LZ 1 - CC Piros/Monarch circa '74
LZII - 'RL' or plum
LZ III- Classic or plum
LZ IV- Porky/Pecko Monarch (or plum).
On Machine Head, I have a UK purple label- need to see what it is- not a bad sounding record.
Layla pretty much sucks.
The first UK of Blind Faith improves what is an ugly recording of some great music.
And so on....

What's wrong with "Trout Mask Replica"? Is it the sound quality or are you put off by the music? I've listened to it countless times on great systems and think its sound quality is fine.

Evidently new remaster of Trout from zappa.com...original performance great...Sonics not so much.

Blue Öyster Cult is NOT a metal band, their 1st NOT a metal album. The debut is a PSYCHEDELIC HEAVY ROCK album, the BEST both in musically & thematically ever recorded in that genre and sounds fantastic and very heavy in fact, on decent stereo system of course. The best debut from 1972 & "Then Came the Last Days of May" is the best ballad played by a rock group without unnecessary string arrangements. It was heavy stuff back in the day, when Buck Dharma ruled the World.

Black Sabbath is very different music really, it´s HEAVY METAL BOOGIE. There is 1 thing they both are similar: the dark mustached lead guitarists play the mighty Gibson SG. The gentleman in white suit Buck Dharma plays white SG, the sinister riff master in black leather Tony Iommi plays the black SG. 

REM Green... over overdubbed and layered into oblivion.