My biggest issue with DS9 was that the main cast was massively under used.
The best episodes I remember are always the ancillary cast. Any Ferengi episode was always great fun, toss in the Grand Nagus or Quarks mother or even Brunt and pow! Garrack routinely stole the spotlight anytime he was featured and even Dukat was ham level great 90% of the time.
Throw in any mirror universe episode, (mirror Kira was ball lickingly awesome), and you could see how the actors shined outside their otherwise dreary roles.
Martok and Worf Klingon episodes were always entertaining and even Wayuen was hard to not love as a smug scheming bastard.
Compare that to the main cast. I cant really think of one purely main cast episode that stands out. Which is a crying shame as the original writers had some bad ass characters to work with.
Kira was a tough as nails revolutionary with a religious background but after 1 episode she's a perfect XO to Sisko despite their obvious differences.
Dax is a 700 year old being full of weird and strange life experiences but nope ...turns into a bog standard Star Fleet science officer.
Bashir, genetically engineered super human? Nah, he's a basic boring doctor type who whiney and annoying as his main character traits.
Hell, they had to go and give them a ship in later seasons to allow them to do some actual Trek like episodes.
I dunno if the writing team was swapped out after the 1st few episodes but such a great opportunity wasted.