I love Congo. I just watched it the other day. But I know most people think otherwise. If there was a topic to list our favorite movies most people thought were crap, I'd immediately list Congo as one of my favorites. Not a masterpiece but definitely has that old jungle adventure movie feel.
I'd say the worst movie I've ever seen was a Redbox rental called "War of the Worlds 2." My fiancee's family got it and watched it. It was New Years Day and were supposed to be spending time with her family. But my goodness, what a dreadful experience!
Hollywood flicks I know are popular or well received I hated and turned off include Kill Bill, Transporter, and Munich. I wanted to like all of those so much but just felt sick watching them!