It looks like a 9 year old's lunch break doodlings, a 9 year old without enough colour crayons, who thinks he knows how to draw perspective but fails miserably. My art teacher is turning in his grave.
To be honest like most of the apparently 'worst of all time' album covers, it's just a decent unrealistic, cartoon like drawing, done in pencil. If it wasn't shaded in with pencil and had been finished off a bit more neatly people would find it acceptable.
The Butt: Actually, I recently read something about the cover, in which I think it was Corpsegrinder, who said that it's his favorite album cover of all time, because it shows the antichrist in a pop-art way. That makes it sound a bit cooler I guess.
S<issors: It could be because a hammer's jammed into it. Also, it just looks like a fake, swollen, thing. The point is, I've seen much more attractive vaginas.