Luckily not! I always try to go to quality films at the cinema, but there are times when I went along with my friends to some terrible films. One of my friends thought the Sucker Punch trailer pretty much looked like the best thing ever so I got dragged along to that one. Saw it in Imax so it cost me extra money as well!
The Expendables was terrible, Battle: LA was pretty poor as well but is enjoyable when you're counting all the cliché militairy lines and actions one can put in a movie. And then there was Max Payne, which I know I went to but I don't remember a thing of what the hell I saw. So either the movie was so awesome it gave me amnesia or it was fucking terrible.
So yeah, I think those are the worst movies I saw in theatres.