I agree with some of the above... and siagree with a few. But oh, heck, I'll just list my own candidates for the Hall Of Shame...
KING KUNG FU -- A martial-arts gorilla! I'm not making it up! We saw the video box, we both laughed uncontrolably, we rented. 10 minutes in, my pal Jim said, "Usually when I see a film with production values this low the actors are NAKED by around this time..."
HALLOWEEN 5 -- the "hero" of the previous movie (which was surprisingly GOOD!) gets killed 15 minutes into this one. The thing meanders for the rest of its length, too much of it with stupid people in badly-shot footage. Then at the end, the "mystery" villain who's been hanging around slaughters an entire prcinct of police-- OFF-CAMERA-- and you suddenly realize the entire film only existed as a SET-UP for the NEXT sequel-- which, just to make it WORSE, didn't come out until 6 years later!!! (ARGH!)
ALIEN 3 -- ditto, on 50 times the budget, and all the more infuriating because the film it's a sequel to was SO FUCKING GOOD on EVERY SINGLE LEVEL that it set a new standard for excellence in its genre, still not topped to this day-- and the follow-up, which was completely uncalled for, utter misguided, and completely creatively bankrupt, was an insult to viewers, to the series it was part of, to those who made it, and to movies in general. (And IF Sigourney Weaver BELIEVES what she said in an interview concerning the film-- she's one of the BIGGEST a-holes in Hollywood...)
You know... BATMAN AND ROBIN DON'T EVEN COME close TO THESE! It's down there... it's just not THAT far down there.