Metallica - The Black Album (1991) - Although, I love half of this album (Sad but True, Through the Never, of Wolf and Man, Wherever I may roam…), the moment when I heard the first single, Enter Sandman, on Zrock, it was a huge let down and a harbinger of doom. The over simplistic, uninspired, pop song with absolutely no edge and none of the powerful ambition on the less than perfect, but still passionate Justice album and not to mention awful lyrics, that was the moment. And a completely Black Album cover - tell me that’s not Spinal Tap.
Megadeth - Risk (1999) - BAD
Iron Maiden - Dance of Death (2003) - In retrospect they went downhill WAY earlier, but this is when I first noticed it. No gallop whatsoever… boring, plodding, pseudo-progressive snoozefest, and the albums after this were the same. This is the moment I stopped liking stuff like Dream Theater and started liking extreme metal a lot more.
Black Sabbath - Born Again (1983) - I love this album, I’m even one of the few people who love the artwork. But when they started excepting this amount of lineup changes was when the band no longer had any hope of keeping up with Ozzy in popularity, and more importantly, the music took a HUGE dive right after this. I actually think their first bad album was Technical Ecstasy, and loved the Dio stuff and Born again, but changing lead singers once and surviving is amazing, doing it twice is impossible, after this it was the Iommi solo project with a lot of boring hired guns.
Morbid Angel - illud divinum insanus rar (2011) - You would have to hear this to believe it.
Aerosmith - whenever that first boring ass ballad with the overproduced video with Tyler’s daughter came out. I don’t remember the song’s name, because there were about five of them around that time which all sounded the same.
Judas Priest - Turbo (1986) - Honorable mention for jumping back (one album only) with Painkiller in 1990
Alice in Chains - Jar of Flies (1994) - they went from good to boring so quickly.
Danzig 5 - Blackaciddevil (1996) - Some would say Danzig 4 because they (he) started experimenting with industrial, but I think it mostly worked and still had that bluesy hard rock song still intact. This album, however, was just sad.
Guns n Roses - when Axl became the only original member - don’t remember when it was or who as the last, Slash or Duff, but it just should have been called Axl Rose after that. Waiting about 50 years for Chinese Democracy and changing band members sixty times while recording the album kind of proves my point…also the album itself - BAD.
In Flames - the album after Clayman - I don’t want to look the name up, it makes me sad.
Led Zeppelin - In through the out door (last album of new stuff) - I love Presence - I hate this - very synth pop sounding, no edge, no groove. I don’t understand how everyone in the world doesn’t agree with me on this one.
Manowar - Louder than Hell (1996) - I know I’m an immature dork for liking this band at all. Shut up.
Mastodon - The Hunter (2011) - I hate to be so cliche, but it’s true. It’s not the un-heavy songs on it that I hate, though. I Love me some “Curl” and said “Burl.” I hate the “heavy” songs on this for the midlife crisis value. In the midsts of a very different, mellower album, “Deathbound” sounds so desperate.
The Sword (2010) - Warp Riders - not hating it for trying something new, just a serious decline from its perfect predecessor, “Gods of the Earth.”
Van Halen - Diver Down (1982) - What was supposed to be an EP getting fleshed out to a full length album by stuffing in some jokes, outtakes, and bad remakes, an omen of the fat, irrelevance, and laziness that was to come with 1984, and from which they’ve never returned.