I really liked Ezri. A far more interesting character then Jadzia ever was. But the problem in that is, not even the writers knew how to handle Jadzia, and they admitted that in several interviews. She went from wise old sage, to resident science geek, to fierce warrior woman, because they couldn't get a clear grasp on her. And in the end, all she really was, was a something like a comic relief, but with sarcasm. Trying to be a smart-ass with witty comments nobody was waiting to her. Which sucked. Since she really did have potential.
Not to mention that half the time I didn't care for Farrell's acting.