unpopular albums that you really like

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I bet most people never even listened to it, or just listened to the first track and thought that was actually representative of the album.
 
Iron Maiden - Fear Of The Dark
In Flames - Reroute to Remain (glad to see this one's already had a few mentions)
Iced Earth - The Glorious Burden
Opeth - Ghost Reveries
Arch Enemy - All the Angela Gossow albums
Killswitch Engage - The End Of Heart... Well OK all their albums
Shadows Fall - The War Within
Meshuggah - Catch Thirty Three
 
I thought Wages Of Sin was a whole hell of a lot better than anything that came after it.
 
In The Woods - Omnio
Grimlair - Locked Up And Forgotten; L'appel de la nuit funeste
Elhaz - Malemort
Raventale - On The Crystal Swings
 
Those are a lot more unknown than unpopular (with the obvious exception of ITW, which I'm pretty sure is not unpopular). :p
 
1. In The Woods are not that popular at all.
2. People, who like In The Woods give more of appreciation to their black metal albums (i.e. The Heart Of Ages)