It doesn't matter if you are a pinball fan or not; I wasn't a big pinball person when I first saw the film. The story told by TILT has got everything a documentary is supposed to have; interesting facts and beautifully illustrated background history, interviews with key contributors (like the guy who invented putting flippers at the bottom of the play field), and a story with an endearing human element to tie everything together.
If you use Netflix or iTunes, go check it out IMMEDIATELY, and don't forget to add the bonus DVD to your Netflix queue. It's got some really great extras. Just do it, have I ever steered you wrong before? Swing by here and let me know what you think afterwards, and if you'd like to buy a copy to own after that, you can get it on the official website.