Stories about him are like a neverending supply of rage. I just recently heard about how he intentionally sabotaged Wil Wheaton's career to avoid having to pay him more.
I didn't know the story behind it until recently, but the first time I watched DS9, I thought "Wait, are they really trying to get away with replacing this awesome character with a younger, cuter actor?" I assumed it was a desperate bid for ratings.
I thought they both did a great job, but we'd had 6 seasons to get attached to Jadzia!
They could of made Dax join with Arjin(Geoffrey Blake) and make it like Curzon choosing Jedzi. At least we'd have better context of the character and we wouldn't have had to spent half of the last season establishing and developing Ezri.