1.) ENT: TATV (It's so bad that I refuse to spell it out.

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2.) VOY: The Fight
3.) VOY: Threshold
4.) DS9: Let He Who Is Without Sin...
5.) TNG: Shades of Grey
6.) TNG: The Outrageous Okona
7.) DS9: Valiant
8.) DS9: Profit and Lace
9.) TNG: Justice
Generally agree with the list. "The Omega Glory" would be on there, but it's so hard to quantify. 3 excellent acts, then 1 horrible act. That might be the most singly abominable act in all of Star Trek. I fail to understand why people hate "The Fight" so much. Ok, it does have the densest piece of technobabble in all Star Trek, but that's just 1 moment, and the boxing and vision portions, I don't see how it can be atrocious, worse than "Ferengi Love Songs", or several other episodes. I can see how it can be mediocre or fall flat, but nothing truly bad. There are several more egregious TNG eps ("Sub Rosa", "A Fistful of Data") and VOY eps (any with Barclay minus "Projections", "Q2", "Renaissance Man").
I remember "Threshold" from its original broadcast. The idea seemed cool, even though the "evolution" idea was laughable. It was in the execution. The episode was to reverse the idea of a character superevolving from going beyond the limits into some big headed brainiac. It also has echoes of Icarus, of the dangers of trying to go beyond human/technological limits. Warp 10 is flying too close to the sun. It might explain why transwarp exists or else the Borg would be cyborg salamanders assimilating the galaxy. It seemed to be modelled off some transformation horror films, notably The Fly (there's also some 1982 one I'm forgetting). It did't seem too bad in 1996, just weird.
If the Silverblood Voyager used Warp 10 to get home, would they "evolve" into transwarp salamanders or maybe puddles of silver goo with rainbow sparkles?
Overall, you have to hand it to Voyager for trying out weird ideas. The series was full of 'em.