Rarest: Spirit, Cactus Canyon, Spectrum, CSI
Best: Roadshow
Worst: I don't really know, I love pretty much all pinball. There are games like No Fear and Who Dunnit which I haven't enjoyed, but if I owned them and spent some time with them i'm sure I would. I don't like the feel of the later Gottleib's like SF2, Wipe Out, Cue Ball Wizard etc