I liked Ezri, mainly because she seemed down to earth and not over top or anything. Being cute didn't hurt either.
I also liked that little speech she gave to Worf on the truth about Klingons.
The one thing I thought was lame was that like Dax, she was a dark haired female, around the same age, with a blue uniform, who just happened to be a Trill on the same ship that they were carrying the Dax symbiont on.
What an amazing coincidence. It's like Jadzia never really went anywhere!!