I don't know the episode names, but for me the worst are anything with Q; anything with evolution, terminally dumb, especially the episode where they all devolve into different animals - please! - and then evolve back in the same episode! -and the Wesley Crusher episode where he takes off with - gag - the Traveler. And I'm not fond of holodeck-takes-over-the-ship episodes, either, at least as a premise; the execution wasn't always bad. I do love, in no particular order, the first Vash episode, any Data episode, Lwaxana Troi episodes, Barclay episodes, episodes that feature Picard or Worf or Alexander. The one in which Worf gets paralyzed is wonderful. The episode in which the crew is out for "30 seconds" but it's really 24 hours and only Data knows the truth is excellent. I'm not a big Wesley Crusher fan, but the episode with Ashley Judd was fun. Lots of silly episodes but some marvelous ones, as well-- too many to mention.
And don't hate on Voyager! Some great time paradox stories there (tho the series finale was too contrived for me), great B'Elanna and Tom episodes, oh! And that great episode about smuggling telepaths through hostile territory in spite of the duplicitous and cultured customs agent! Not to mention the episode in which Jane way and Chakotay are quarantined on a planet together.
And then there's Deep Space 9....!