What i really really hate is "a book with a plot twist in the end that'll make you reread the whole book again!" ... why do I need to know that there will be a plot twist? Now i'll expect it, and know that the 'obvious' murdeder isn't the one guilty of murder, but some twist will change everything.
Same for the movies... where the trailer has enough spoilers to see how the movie ends and who the murderer is.... it sucks... and it's not even a columbo-like movie, where you see the murder in the first scene, both you and Columbo know who the murderer is 2 minutes in, and you just wait to see how he "gets him"...