my complaint is that it fails, at least partially anyway, at being journey music. a journey requires coherence kind of by definition, and the same goes for sustaining or developing a mood - obviously jarring transitions can sometimes serve a conceptual purpose but in opeth's case they just don't have an instinct for flow, nor do they have quality control, nor the humility to recognise their own limitations etc (all of which is true of most prog metal when compared to prog rock and/or trad metal, let's face it). i think they matured into somewhat less crude songwriters after this album, but they also slowly started to run out of good ideas unfortunately.
but w/e, none of this mattered to me when i was 14 and i'm not sure i've ever been so deeply moved by music before or since. this album (all the first five really) will always have a place in my heart.