For me, the movie I had the worst luck with was with Sabrina's and the doors, due to how I would have bad luck trying to perform them correctly.
Otherwise, I liked how the movies were sort of like puzzles to try and solve, and getting Strange Endings and making my Pokémon into stars was just cheesy enough for me to sink time into. It also helps that it's one of the more fun Trainer Card achievements in the series, AND you also get a lot of cash for doing well in movies. It's a real win to you, as the player.