The reviews decrying this film seem to have genuinely missed the fact that it's a comedy. Sure, all of it is deadpan but really, a biker gang who do a great doo-wop Rock Of Ages? A guy whose mudwrestler girlfriend gets into laundromat machines after work? It's a comedy, folks.
The reviewers complaining of the lack of action scenes or soft porn might as well level the same criticisms at Airplane. Indeed, Airplane's a good point of reference with the straight-faced humour, visual gags and touches of surrealism.
It plays on many 'good guys seeking out the evil-doers' clichés, and simultaneously on fated-lovers clichés too. The funniest stuff is in the way it plays with gender role and 'wrong side of the tracks' stereotypes.
The great and eminently quotable cheesy dialogue and the constant overloud leather-creak whenever anyone moves keep it relentlessly funny from start to finish.
If you like the comic edge of Sam Raimi and Bruce Campbell's work in The Evil Dead you'll love this film. If, however, you thought Evil Dead was a straight zombie flick then you'll probably miss the point with this too.