It is quite possibly the best metal album ever made; and I don't say that lightly.
In terms of quantity vs. quality, metal music is probably the top-contender for AAA songs. But even still, there aren't many out there who can compete with the quality of Opeth.
Scar Symmetry's "Holographic Universe," however, is god damned top-notch. The band's first three albums only have like two 'decent' songs, whereas the others are all bangers.
They never really got the fame they deserved. Per Nilsson's involvement with Meshuggah will hopefully garner him some more attention and respect, but the entire band really deserves more than they get; especially the drummer, Henrik Ohlsson.
For example...