Star Trek V

Ghostbusters 2

back to the future II and III

King Kong Lives

Over the Top

No Holds Barred

Jaws II, III and IV

Any rocky movie after part 2.

He man

Flash Gordon

Howard the Duck

the running man

total recall

Karate Kid films beyond the first one.

Superman IV

All the Police Academy sequels

Poltergeist sequels

Remember people this is all a matter of opinion. I am sure their are those who will List The Temple of Doom or Return of the Jedi as the worst films. I know some people would list return to oz by walter murch because it was an abomination to the judy garland fiim.