HA! One guy loves this album and the other guy hates it. I was giving this three stars before I even look at the two other reviews, but now this even makes more sense.
This is not bad by any standard. Raw Material uses some progressive elements here--flute, sax, jazzy vibraphone--and works nice solos. Some of this music is based on hard rock/blues structures, not quite prog, but the soloing and the ambition make this proto-prog if not the genuine article.
The problem I find is that there are a lot of different song ideas here; they are all good but very disperate, and the album does not seem to head in any one direction. There is no center of gravity.
Still, worth a listen