Inception, Dark Knight, The Dark Knight Rises, Avatar, Avengers, All 8 of the HP films (yeah I said it bitches), I Am Legend and The Pursuit of Happyness.
The films mentioned above (expect probably Avatar and the Avengers) aren't 'poo' per se but just very overrated. There are so much more poignant, thought provoking and breathtaking films out there that are virtually unheard of.
Edit: I've pretty much said what everyone else has said so why I'm a getting a cascade of negs? Have I personally victimised you?