But i can't say that Ezri Dax is more Ezri than Dax, because we don't have much information on Ezri to begin with... the fact is Jadzia Dax might have been more Jadzia than Dax compared to Curzon, without a LOT of information about the joining aspect, we can't make assumptions about how much personality of the host remains after joining...
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Here's my reason for saying that...
When we first saw Trill in TNG's "The Host" the symbiont was everything, and the host was just a body. As was the case when Odan entered Riker, Riker's personality was pretty much gone. And again when Odan entered the female body, the host's personality was taken over completely.
When DS9 first began, it seemed like they were going that same route. Jadzia had this very "Old Man" personality that you were led to believe she got from the wisdom, experience and age of the symbiont, specifically her previous host who was an Old Man. But as the show went on, her protrayal began to change. She was less Old Man and more Young Woman. The question is, is this the natural evolution of the host/symbiont relationship or is it just lazy writers who don't have handle on the character? My vote is for the latter.
And if that's indeed the natural progression of the Trill relationship, then in my opinion Ezri should start out very Jadzia-like and slowly evolve into her own persona. But she doesn't, instead the Dax symbiont seems to influence her actual personality very little. By the time the Ezri character is written, the Trill symbiont is nothing more than a set of jumbled memores that do little more than cause confusion. The all-encompasing Trill symbiont first described is gone.
And I think it's because the writers didn't count on us fan nit-picking them to death
Oh, and I do want to add that in hindsight, I like Ezri more than Jadzia. When the spoilers first hit the 'net that Farrell was leaving the show I was pretty annoyed, but that was more because Worf had to watch another woman he loved die than because I'd miss Jadzia. To that end, I was determined to not like Ezri. But after re-watching the series, Ezri's character is much more interesting than Jadzia. She got more development in 1 season than Jadzia got in 6. Jadzia was too "I know everything" perfect and therefore boring.