Alien Resurrection:
This is made worse because I actually like the series a lot, as well as the adult comics based on it. The first time I watched this, I couldn't believe how bad it was. I felt truly insulted and horrified. I've seen it a couple of times since--never all the way through--and it has yet to grow on me. Blah.
Jurassic Park III:
Little more than an outlandish, moronic chase movie. The "conclusion", such as it was, infuriated the hell out of me, being an insulting deux ex machina.
Monkey Trouble:
One of the many dumb films I was forced to sit through as a teenager.
Small Soldiers:
Dennis Leary as a CEO. Now *that's* funny.
Kazaam:
It's Shaq. Guess its value.
The Garbage Pail Kids Movie:
This explains itself. Don't ask.*
The Stupids:
Ditto.
There are others, but these came to mind first.
*The worst by far.