+1
I don't understand how anyone ever had expectations for most of these movies. It's pretty obvious that "Vampires Suck" is going to be horrible. Same with Dinner for Schmucks, The Losers, etc.
I don't think Catfish belongs here though unless this thread was changed to "Most Disappointing". If someone told you the truth (that it's a non-horror documentary about meeting someone online and they turn out to be fat and weird) then it is very interesting to watch. I'd rather watch it than another doc about the food industry or the financial woes of small towns vs. Wal-Mart.
I am surprised that no one mentioned one of the Twilight movies. I had to sit through one with a friend and it honestly does not qualify as a story.