The screenplay is a prepubescent shambles, the direction is by acne out of disposable douches, the dubbing and looping of the songs is painfully obvious, the characterizations are generally repulsive and the whole thing is utterly without style.
I love the film's energy. I love the movie-star charisma of John Travolta in the lead. I love the "am I doing this right?" hesitancy of much of Olivia Newton-John's performance. I love the fact that the film is so unapologetically filthy.
There's a surprising strain of filth, too - this is much closer to Hairspray than High School Musical. The message is: burn rubber, have sex, strut about like a chicken. It's one that's hard to resist.