I love the themes, they are as much to me as the gameplay. The artwork sets the mood of the goals, the DMD animations elevate the silver ball hitting things, to actual accomplishments that build on the adventure.
The JP T-Rex eating the ball with the lightning and rain on the DMD takes me into a great movie with some of the best movie dinosaurs I have ever seen. Part of the reason I like that pin so much is because the movie was so cool, it is pretty far down the ratings and I couldn't care less.
Back in college, there were two pins in the game room, MM and DW, and I loved the old TV show so much that I only played the MM a handful of times. Still to this day I wonder why that MM didn't have more of a pull for me.