Doom Let Loose is a great Black Sabbath biography and very well executed for a number of reasons: Many other band biographies make the mistake of spending what seems to be an endless amount of time dissecting the band's prehistoric days, describing the band members' childhood and other ancient stuff that hasn't really got anything to do with the music, and by the time the band releases their first album we're already halfway through the book. Doom Let Loose, however, goes straight to the point, with only one chapter devoted to the time before Sabbath's first album. From that point on, every album has its own chapter in the book, and each album and song is analysed carefully. Yes, it's Sabbath's whole recording career (up to 1998's "Reunion") that is being discussed, rather than just focusing on the Ozzy years. Digging into the obscure period of circa 1984 - 1989 is especially compelling. And whether you like it or not, it should be acknowledged that all those albums and years do have their place in the Sabbath chronology, and should not be ignored.
The book is filled with numerous interviews of various Sabbath members (past and present), and full of countless little snippets and musical trivia. Of course, in some instances the different parties contradict each other's stories, and it's difficult to sort out who is telling the truth, but I guess that's just unavoidable due to all the acrimonious splits and line-up changes in the band. Also, what is great about this book are the numerous colour pictures: promotional photos, live pics, scans of magazine covers, singles and bootleg albums... it's all rather compelling stuff.
Although chapter titles such as "Lots of dope on the fire" or "Smashed out of me brains" might suggest otherwise, the emphasis in this book is first and foremost on the music, rather than the band members' various escapades with booze and narcotics, or other backstage shenanigans (if it's that part of the story you're after, check out Ozzy's own I Am Ozzy). And for once, the grimace-inducing The Osbournes is left unmentioned.
Occasionally, the perspective isn't 100% objective, and the writer's own opinions are voiced here and there, but even that is done in a way that isn't really annoying. Popoff usually supports his arguments convincingly, rather than just bluntly stating "this is great, but that sucks" (if you've read Joel McIver's Slayer biography, you know what I mean).
Writing a great band biography is very difficult, and with a band with a career as long as Sabbath's, the penning of this book must have been an arduous task. Still, Popoff has managed to create what is by far one of the best rock biographies I've come across. Highly recommended.