Truthfully I don’t consider any of these movies “Bad” simply underappreciated:
Waterworld: Why didn’t anybody like this? Am I the only person who actually likes Kevin Costner?
Halloween III: The only movie in the series that didn’t have the killer in it and the only good movie in the series.
Popeye: I really liked this movie, it’s charming and Robin Williams is quite funny.
The Blair Witch Project: I wouldn’t call this a great movie, but it’s definitely different.
Bad movies I don’t mind watching:
Plan 9 From Outer Space
Suburban Commando
Revenge Of The Killer Tomatoes.
Any King Kong/ Godzilla movie.