Most disappointing movie you ever saw?

I just realized how many movies have been below par and failed to meet expectations lately. Spiderman 3, shrek 3, pirates 2, pirates 3, live free or die hard(for some), Xmen 3, terminator 3, matrix 3(for some), transformers, the list goes on and on. Big budget movies have just been sucking a lot lately, so I want to know, which one left you with the most disappointment? It doesnt have to be recent, any movie you ever saw and walked out feeling betrayed or confused as to what the hell they were thinking.

I was debating between spiderman and xmen, I thought xmen for awhile but I had doubts before it was released, ratner and all. Spidey had the same director and all that so I was expecting great things no matter what, then it just surprises you with how awful it is. I didnt know if I liked it or not while I was watching it, sort of felt different than the other two. Then the butler came in, and I knew it was inferior at that point.

Fantastic four was also a letdown, I was hoping for the next spiderman, sadly we all know how that turned out.

Transformers was just.....agh. I never thought my main complaint from this movie would be the lack of well done action scenes. The first few were okay, then all of sudden in the final battle what happens!?!? The entire thing is spent with the camera on Sam witwicky or some other human no one cares about as the transformers are just sort of in the background, randomly firing lasers and smashing into buildings but you cant see it! Then theres that waste of money and time frenzy, god that pissed me off. God, 30 minutes in line and holding your urge to go to the bathroom midway through the film and for what?

Surprisingly enough for me, 3:10 to Yuma was a letdown. So many times I heard how great it was and how it was a refresher from the awful flicks lately, please. I liked it, it was okay. Christian bales character though, man he was BORING! Ben Wade I didnt like much, which is probably why I dont like this film. Every review ive seen pretty much implies that this movie is relying on you to fall in love with the Russel Crowe character, im afraid this didnt happen.

Dont even get me started on 2001 ASO, I was expecting the greatest movie of all time and got a live action slideshow of paintings and fancy colors all tied together with some bad classical music. I dont think symbolism alone makes a good movie sadly.

What is your biggest letdown so far?