Don't understand why it's so underrated. The songs are very good. Know there were some personal problems back then but, c'mon, just listen to the title track, Go to Hell, Loser, America, Shut It Down, (Don't Need) Religion. If those difficulties affected the album in any way, they didn't harm it for sure.
... and (Don't Need) Religion is predecessor to Orgasmatron I think.
"Motörhead cannot be clean, it has to be mean" - myself.