Rarest: Banzai Run (the one we have, that is also NOT FOR SALE).
Best: Indiana Jones: The Pinball Adventure. Seriously, combining the extreme awesomeness, rarity, AND nostalgia of playing this game when I was little, stepping up to this marvel the short time it was in the arcade was pretty humbling.
Worst: Hmm. I might actually say Hook, although its another one I played when I was young. It's fun and the music is great, but let's be honest: very repetitive (music especially), no clear objectives, and no official rule sheet. Really?