It's an infamously divisive record in Sabbath canon, and the guttural production didn't help things (holy fuck though, I
love how this thing sounds - haven't heard the 2011 remaster, never really wanted to). Even the sleeve art gets roundly abused by much of the fanbase and the band themselves.

I always thought it looked like Rotten Ralph tearing his own face off - that's pretty fuckin metal!
A lot of it is fairly standard (though very good) metallic hard rock, ie
Trashed, Hot Line, Digital Bitch - but
Zero The Hero and
Disturbing The Priest are pummelling idiosyncratic monsters. Always loved the latter's oddly lurching, screeching riff and battering drum breaks, plus Gillan's absolutely batshit feral hollering (
wtf?). The lyrics make me laugh tbh, they're like something I'd find on the back of a Famicom STG manual.
LET'S
TRY
GETTING TO THE SKY!
(HANG ON OR YOU'RE GOING TO DIE)