I’m going to define both “bad” and “genuinely enjoy”.
The best definition of “bad” I can come up with is below 50% on Rotten Tomatoes. So, pretty bad, but leaves open some wiggle room for not truly terrible movies.
“Genuinely enjoy” means not that you enjoy it ironically, or it’s so bad that it’s good. It means that you think that it’s a decent movie and you enjoy watching it.
Waterworld (43%) - Look, I get that it wasn’t great. But, it was fun and I like it.
Alien 3 (42%) - The weakest of the series (not counting the “vs. Predator” movies, which don’t count) for sure. But, I’ve watched it several times because I’ve enjoyed it. Though, it did sort of shit all over Alien 2 by unceremoniously killing off a character before the opening credits.
Rocky 4 (44%) - Dated? Yes. Quotable as hell, and I will cry like a baby when Apollo Creed dies.
Vanilla Sky (40%) - I was actually surprised to find out that this was not a well liked movie.
Children of the Corn (39%) - OK. Haven’t seen it in a long time, and it might not have aged well. But, I watched the hell out of this movie as a kid.