why is this band underrated and overlooked compared with Zeppelin or Sabbath?

Warning: critics' band, managed by Sandy Pearlman with occasional lyrics by R. Meltzer. Reassurance: the most musical hard rock album since Who's Next. (Well, that's less than six months, and this is not a great time for hard rock albums.) The style is technocratic psychedelic, a distanced, decisively post-Altamont reworking of the hallucinogenic guitar patterns of yore, with lots of heavy trappings. Not that they don't have a lyrical side. In "Then Came the Last Days of May," for instance, four young men ride out to seek their fortune in the dope biz and one makes his by wasting the other three. B+