BTW: Needless to say, I most strongly and vehemently disagree with the denunciation and genral shrug-off of Ezri Dax by Dukhat. Claiming she is "whiny" because she is open and honest about her vulnerabilities is a most unfortunate mischaracterization.
You can strongly and vehemently disagree with me all you want, but it won't change my opinion that she was a little whiny crybaby with emotional and family issues that was really unnecessary to bring into the final season of the show.
Furthermore, as to the argument that Ezri's presence ruins the effect of "people die in war"...ah, no, just the opposite. Her presence--and the other characters adjusting to it--is the living embodiment of people acknowledging death--and recovering. Remember the emotional support Jake noted that Ezri provided to Sisko, just by her being there. The same goes for Julian Bashir...and, eventually, for Worf. Many were the references to the fact that Jadzia was dead.
And if that were the real reason she was brought onto the show, that would have been fine. But it wasn't. She was brought onto the show to provide awkward sexual tension silliness between Worf and Bashir, not emotional support. These people are supposed to be right in the middle of a war, and Julian is acting like a high-school kid worrying whether Ezri likes him or not.
After all--what would be the alternative? Having the characters sit back and reflect on "I wish Jadzia were here..." reminiscing, expressing grief at her death--to the point of it getting old? Or having them "get over it", and then not really bring it up--which would have been nonsensical?
I'd bet that most of the crew would have just gotten on with their lives just like the TNG crew did when Tasha Yar died, and the audience wouldn't have given a shit. Jadzia was the most unpopular DS9 character. The fact that she got killed, and that Worf avenged her death with his attack on the Dominion base, would have been enough of a conclusion to the character.