Maybe it's one's ability to recognize a plot hole but not let it ruin the movie for you? I'll admit that it's annoying when a character does something stupidly complex when a more simple solution is right before them, or when a writer uses an implausible solution like hacking an alien space ship computer with a laptop, a la Independence Day. I can shrug it off, though, as a bad choice or lazy writing and still enjoy the rest of the movie. I've watched Fifth Element a dozen times and love the interaction between Bruce Willis and Milla Jovovich (who is totally hot in that movie) but I can see how Chris Tucker's and Gary Oldman's characters can push the movie into 'bad' territory.
I might be one of the few that sat all the way through Plan 9 From Outer Space but I think Backaroo Bonzai was just plain bad.