Pokestar is neat, though it can be annoying to fail because of crits or burn chances etc. My favorite series is probably Ghost Eraser. It's the hardest without actually being annoying and Majin is pretty funny.
As for experience, I actually mustered up the patience to finish every movie just a few days ago. The Gold trainer card upgrade was definitely worth it. Plus I got a bunch of money selling the gifts from fans. About 50k per movie!