Part of what got me into pinball is its immediacy. I was playing games that would require about an hour of your time at minimum to do anything worthwhile. I got my Flash and would plug at the start button when I had 5 minutes to spare. The beauty of it to me is that I can play a game in a short time and leave it, and I've still had a full experience.
I'm also the kind of guy that would skip cut scenes in games like Halo, unless the story was really engaging or gave a directive.