Just as one can argue that there are different types of good movies, there are also different types of bad movies. They can be bad due to directorial overreach, inane dialogue, inept acting, or awful effects. However, the worst sin a movie can commit is to be boring. Movies are inteded to entertain – when a movie fails to do even that, it is irredeemably Bad.
Boring movies are not the ones that attract legions of followers. It’s the others, the ones that fail on technical levels. The ones where we, the audience, can either point and laugh at the great heap of failure on screen, or gape open-mouthed in disbelief at what we have just seen. Those are the ones worth watching. And sometimes, even as we slog through the mountain of garbage, we discover something that makes us say, “You know, that bit wasn’t completely awful.”