Most of their 'music' (to the extent it ever reaches a level of coherence such that it might be considered music at all) is pretty much straight up prog metal, and the rest is far closer to My Dying Bride or Katatonia style doom metal than even the least masculine of death metal. The only element of Opeth's music that even remotely resembles actual death metal are the vocals, and that's hardly significant.
No argument here. Bloodbath is crap; I agree fully with this sentiment.
Let me refer you to the thread title, eh?
Greatest Death Metal Release
Now what part of that sounds like 'favorite' albums, or 'quality not required' to you?