Not saying these are the worst pins there are, just the low on my list of what I've played (mostly 1990+ stuff), and theres TONS I haven't played...
Star Trek (Pro) - Stern (I just can't get into this one, it's a newer machine, and its at a nearby pizza place, but it seems like I put my money it, just to watch 3 balls drain instantly. I get like 30 seconds of play total)
BlackHole - Gottlieb (just a "meh" machine to me)
??? - ??? (I'll have to add this later, theres a machine I played at a local taco shop, and it escapes my thought at the moment, but I didn't like it. I only played it once, left a bad taste in my mouth when the first ball got stuck and then I couldn't proceed, even after nudging the machine and getting a TILT, I couldn't free the ball) From memory. I think I remember a rope that goes across the play field, that held a white ball (cue ball or a golf ball) and you'd hit it with the pinball. I think it was either golf or billiard themed.
Revenge From Mars - Bally (Not a bad game, it's playable and kinda unique and fun, but I could never really focus and see the game clearly with the holopin stuff. I'm in my late 20's with perfect eye sight but just cant see the game clearly enough)