Well...personally (and I'm resonably sure this is the reason other fans give), I think the Worf/Troi thing was taking the "opposites attract" thing a
bit too far.
Sorry, but...IMHO, they're just
not compatible.
Now,
Jadzia/Worf was COMPLETELY believable--those two blend together
wonderfully!
Just like Ezri/Julian--I tell ya, those two were MADE for each other.
I am not sure why so many people hate Worf/Jadzia. I thought they were really good and funny together. Worf was certainly funnier to watch when Jadzia was driving his crazy, than when he was just sulking and talking about honor to whoever was there.

That may be why I never hated "Let He Who Is Without Sin..." even though the 'message' was so heavy-handed. Their interactions were quite good (particularly when Worf tells her about the boy he accidentally killed in his childhood) and saved the episode IMO.
Also, the pairing made sense since 1) Jadzia Dax always had a thing for Klingons (whether it came from her or from Curzon, or both), and 2) Jadzia has a few things in common with K'Ehleyr. Both of them had something Klingon and something very non-Klingon about them at the same time (a common thing for women Worf fell for, apart from Troi - remember the half-Romulan Ba'el, who did not fit in the Klingon culture, either), both were very strong and confident women who loved their freedom, were a lot more open-minded than Worf,and could drive him crazy with their irreverence about some of the values he believed in, and because he felt he could not control them.
Worf/Troi, on the other hand... seemed a bit random, and not very exciting.
I don't understand people who dislike Kira or criticize Nana Visitor's acting, and I don't understand people who find Bajorans and episodes about their politics boring.
I also don't get how some people can dislike "This Side of Paradise".
And I forgot to add - I definitely don't understand why some people claim that DS9 only got good when the Dominion was introduced, and that the first 2 seasons were weak? Come on people - the pilot, "Duet", "In The Hands of the Prophets", the Circle trilogy, "Necessary Evil", "Cardassians", "Whispers", "The Maquis", "The Wire"...?