Opeth - Heritage
I think it's one of their best albums, while most consider it one of their worst. And while Pale Communion is generally considered a step up, I disagree (not to say PC is bad).
This so much. I'm not, like, a huge Opeth fan—I really only listen to their albums
Ghost Reveries and later—but I like this album a ton. I feel like it's got a perfect atmosphere and is the rare album where I like how meandering and noodly it is. My favorite Opeth album alongside
Watershed, and probably ahead of it.
I'd also third
Death Magnetic and second
Load and
Reload. Particularly the latter two—so many of my favorite Metallica songs come from those albums: Fixxxer, The Outlaw Torn, Hero of the Day, Low Man's Lyric, Until It Sleeps, etc.
In addition, I would add:
Coldplay - Mylo Xyloto and Ghost StoriesColdplay gets a lot of hate always, and particularly for "going pop." But I think at least some of the hatred directed towards these two albums stems from a fixation on instrumentation. Because they definitely retained a great deal of their songwriting style and ability from their early albums, but applied it to a totally different instrumental style. I think these two form an interesting duo, because MX is blazingly upbeat and happy, while GS is a very muted, therapeutic, depressed album. But both of them resonate very strongly with me and my view of life. And they have some truly incredible songs: Hurts Like Heaven, Every Teardrop Is a Waterfall, Us Against the World, Don't Let It Break Your Heart on
Mylo Xyloto and True Love, Midnight and Oceans on
Ghost Stories. Anyone who doesn't like pop isn't going to like these, but for those who do like pop, I think they're worth a look. At least check Every Teardrop Is a Waterfall and Midnight.
Iron Maiden - The X Factor and Virtual XII've said this many times already, so I will be brief, but the two Blaze albums were essential to Iron Maiden's development. Sometimes people act like
Brave New World was this revelation that came out of nowhere, but really it was an outgrowth of leaps and bounds of progress on these two albums.
The X Factor is the better and the better-liked of these two (having undergone somewhat of an image rehabilitation) and is one of a few truly depressed albums that I care for, but
Virtual XI is both interesting as a proto-BNW and good in its own right. Beyond The Clansman and Futureal, look to When Two Worlds Collide and Como Estais Amigos. Also, try to imagine The Angel and the Gambler with about half the choruses taken out—I think it's a good radio rock song that goes on a bit too long.
Transatlantic - KaleidoscopeThis isn't really a hated album, but it's seen as a lot of "Transatlantic by numbers," and easily the weakest of the four albums, which I think sells it short. Call it by numbers if you want, but this one distills a lot of what I love about Transatlantic into a single album. It has the best short non-ballad they've done in Black as the Sky, it has tons of sections that emphasize the different vocalists and is overall just a fun album. I really like the title track, and I think it's one of the band's better epics (Into the Blue not so much, but it's still good). the Black Gold section is so much fun, and the rest is exceptional as well.