I'm sorry. I must disagree.
1) I just don't see it. Her character os pretty consistent throughout the show.
2) She actually gets called on that in one ep.
3) Sisko and Curzon were very close. Jadzia and Sisko...not as much. But i enjoy how comfortable they are around each other without devoting any time explaining it for us.
If I had a problem with her, it would be that she has no real arc in the show. I'm actually pretty neutral about her.
Hopefully after she's gone you enjoy the show more...and hopefully after she's gone, there's not a...certain... moment where you go, "What the???"