Echoing a lot of the statements in here, I'm glad she never made it onto DS9.
No show is going to have itself figured out midway through Season 1. Sure, she was a bit player, but the possibilities were endless for the character.
When she was given something to do, she was wooden and painful to watch. When she failed at having a movie career, she tried to go back to the franchise she had spited and for some incomprehensible reason, they let her come back as Sela.