For me it has to be pain and gain. Every time I see the movie I feel like my IQ is dropping. They were so unbelievable stupid in the movie. They had everything they wanted and they messed it up for themselves. And the worst part is that it's a true life story so there are actually people as dumb as that in real life.
Probably Pearl Harbor. It was meant to be a war film depicting the Japanese attacking the American Fleet and they ruined it by making it into a love story. I honestly hate that side of Hollywood and rather keep the war angle than bring in some soppy loving.