I could agree that Forrest Gump is among the most overrated movies, but overall worst? No fuggin' way. At the very least, it was well acted. On that merit alone, it can't possibly be the worst major motion picture.
My vote is for a recent one, Meet the Fockers. The worst part is that it's a franchise filled to the brim with good actors. I think they must have all gotten a collective brain aneurysm 5 minutes before accepting their roles once again.
Absolutely disagree, Pete. Is there a lot of contrived crap? Absolutely. But if you're willing to do the legwork in terms of research, there's still a ton of good cinema out there.