My 2 cents on each album:
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Orchid - raw, weird, great moments, but not as good songwriting as a whole
Morningrise - dark, romantic, nostalgic, beautiful, perfect
My Arms Your Hearse - sad, aggressive, best story (lyrics)
Still Life - classical, foreign melodies, acoustic, soft, pretty
Blackwater Park - best production, progressive, powerful, with glimpses of myst and weirdness, overall most straight forward which for me translates into slightly boring
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My personal pick is Morningrise as the best cd. not because of song writing, not because of sound quality, not because of great lyrics. Its just unexplainable to me what this CD has that others do not.
By the way, All opeth cd's are better than 99% of all other metal releases.
Sfarog