The good parts made me glad I’d suffered trough the bad parts. There were too many painful parts to bother skipping through them all; besides, if you did this you’d miss too much of the movie to make it worth watching any of it. Furthermore, many of the good bits were only funny in (bad) context. It’s worth watching, though. At least once.
In retrospect or introspect or circumspect (looking somewhere, anyway), most movies are worth watching at least once. Expands your world experience. Makes you a more interesting person.