I'm not a big fan of the Conan movies, my favorite of the three is Conan the Destroyer, and it's far from good.
I haven't seen Ladyhawke since the 1980s, don't remember finding it all that enjoyable. Great cast, bad story.
I actively hate The Dark Crystal. The Gelflings seemed like useless heroes, and the monsters didn't do anything for me either. I would argue Labyrinth is the better Muppet fantasy movie, and I find Labyrinth to be fairly flawed.
I'm not going to defend that joke as reality, but it was certainly our perception at the time. There are a ton of bad sci fi movies, but there are good ones to counterbalance that, and the best sci fi films were ones we watched over and over. Fantasy movies, by comparison, just didn't seem to have that top tier.