Is there a TV show, movie or book you would like, if it weren't for a "devastating" plot-hole?

I think Medium would be an okay show if it weren’t for one huge plot-hole: THEY NEVER LISTEN TO THE DAMN WOMAN! I mean, sure it’d be okay if the first few times they didn’t believe in what she says, but after a few times, why, oh, why, don’t they think “hey, this chick has been right on the money EVERY SINGLE TIME, maybe we should do as she suggests this time?” ARGH!

Does this happen to you with other shows, movies or books?