As determined by searching for "worst episodes DS9" and applying math to the findings
Presented in order from Sucky to Suckiest, with commentary, by somebody who needs sleep
Otherwise known as The One Where There Was A Ship Full Of Cadets. Earns ire for, and inspires fear of, a ship commanded by YA clones of Wesley Crusher and Marissa Picard, Stephen Ratliff's legendary Mary Sue. The episode earns points in my book for realizing halfway through that perhaps this idea wasn't so hot in the first place so let's not have a spin-off, thank you very much.
9. "IF WISHES WERE HORSES"
Otherwise known as The One With Rumplestiltskin Yes Really Go Look It Up No I Don't Know What They Were Thinking Either. First season episode where the holosuites go crazy due to $SCIENCE and start pumping out versions of people's dreams. There were a lot of stinkers in the first season, and this was one of them.
Otherwise known as The One With Q, because... it's the one with Q. They had to have him on at some point, so they did it as quickly as possible in the first season to get ratings. See above in re: first season stinkers. I actually like the ending of this one, if only because Q has a nifty little revelation: It takes the perspective of one of those silly mortals to make him realize that all the things he's seen and done are TOTALLY AWESOME because he's Q. He snaps out of the episode slightly less blase, and that's fine by me.
Otherwise known as The One Where Dax Goes Into An Alternate Dimension And Falls In Love. I didn't hate this one and honestly don't have much to snark about, but the Internet sure detested it enough.
Otherwise known as The One Where Lwaxana Troi Shows Up And Makes Everybody Fall In Love. I admit I have a soft spot for Lwaxana because when she shows up, it's simply to troll the heck out of the episode. Who else can drive Picard crazy? Oh, that Lwaxana. She has a problem, though: if the episode she's in stinks, she's usually written as completely obnoxious. When the episode isn't so bad, like the one in which she gets stuck in a turbolift with Odo (and let that fact sink in: "Fascination" is worse than a stuck-in-an-elevator episode) she drops the obnoxious caricature and turns out all right. In the turbolift episode she's maternally kind to Odo and I like that relationship. In "Fascination", however, all Lwaxana does is go nuts with the innuendo.
5. "LET HE WHO IS WITHOUT SIN"
Otherwise known as The One Where They All Go To Risa And Worf Becomes A Total Downer. The general consensus of the Internet is that this episode stinks because A. it's all about sex but had to be toned down to the point where backrubs are scandalous and B. Worf is a big stinky party pooper with more issues than the New Yorker. While everybody else is swappin' backrubs, Worf turns prickly and joins up with a group of similar malcontents with a plan, obstensibly thought up by a Batman villain, to ruin Risa by controlling the weather. They attempt to make it rain all the time, because as we all know you can't give backrubs while it rains. Worf's a wet blanket through and through, but going in with these jerks is a bit too much, even for Mr. Grumpyface.
4. "THE STORYTELLER"
Otherwise known as The One Where If We Believe Really Hard, Boys And Girls, We Can Make That Monster Go Away. Bashir and O'Brien visit Gullible Town, a backwater Bajoran village where the inhabitants are periodically menaced by a big evil cloud and to drive it off, a spiritual storyteller leads them in what amounts to a collective Care Bear Stare. The Internet doesn't like this episode mostly because these are some of the first native Bajorans we meet in the series and, well, they turn out to be as dumb as rocks and ready to believe anything as long as it's said by some guy standing on those rocks. Not the best introduction but fortunately this characterization of Bajorans was quickly forgotten. In place of the yokels we instead got the likes of Vedek Bareil and Louise Fletcher's Kai Winn, whose character easily ties Gul Dukat for Best DS9 Villain.
3. "PROFIT AND LACE"
Otherwise known as The One Where Misogynistic Quark Becomes A Fe-male And Learns Valuable Lessons Which Won't Be Retained Into Next Week. Even us smart, discerning science-fiction fans who like the Ferengi episodes ("The Magnificent Ferengi" is absolutely brilliant) can't stand this one. It's another frustrating exercise in Ferengi misogyny which begins with Quark sexually harrassing a Dabo girl and ends with Quark having a change of heart about all fe-males everywhere. I believe this episode inspires his fourth or fifth. Wallace Shawn also doesn't bother to help as the screechy Grand Nagus Zek. It's clear he's having the time of his life playing a Ferengi, but man oh man he's irritating.
2. "THE MUSE"
Otherwise known as The One Where Jake Sisko Gets Seduced By A Creepy Creative Vampire. Oh, look, Jake is being a struggling writer. Oh, look, a mysterious woman from out of nowhere gives him a magic pen and inspires him. Oh, don't look, it's unsettling watching her "inspire" him. Oh, look, his writing's not that great but now it's supposed to be terrific. Oh, look, she's dangerous. Oh, look, Jake's out cold in the infirmary. Meanwhile, Lwaxana and Odo get married. (Long story, but better than the one Jake's writing.)
1. "MOVE ALONG HOME"
Otherwise known as ALLAMARAINE, COUNT TO FOUR, ALLAMARAINE, THEN THREE MORE. Another ludicrous first season episode where the gang gets sucked into a living board game thanks to $ALIEN_OF_THE_WEEK, and have to play their way out by solving puzzles, playing hopscotch, and not choking to death on poison gas. At the end it's revealed that they weren't really in any kind of mortal danger, so the life-or-death struggle which was so cool in the malevolent board game resignedly flops to the ground and stops speaking to anyone. I liked the concept of the game, however, and think Sisko and Kira grudgingly doing the Allamaraine Dance is absolutely hilarious. Otherwise, pbbbththth. The "Worst Of" lists I found differed wildly in some cases, but this episode was the one everybody agreed on.
* THE ONE WHERE KIRA MEETS SEXY EVIL MIRROR UNIVERSE KIRA
* THE ONE WHERE BASHIR FALLS IN LOVE WITH THE STUBBORN WOMAN IN THE WHEELCHAIR
* THE ONE WHERE WEE MOLLY O'BRIEN FALLS INTO A TIME VORTEX AND COMES OUT ALL L'ENFANT SAUVAGE AND STUFF
NOT ON THIS LIST BECAUSE NOBODY REALLY LISTED IT AND BECAUSE IT'S AWESOME
* THE ONE WITH THE BASEBALL GAME