I'm currently near the end of the fifth season, and I just keep getting blown away by this woman. Her performance in "The Darkness and the Light" springs to mind, for one. The scene where she's lying on the biobed and telling Odo that story about joining the Shakaar...Nana just frakking nails it. I know people talk about how the cast was very good (with the exception of Farrell, though she did improve), but Nana just doesn't get singled out enough. She makes every scene she's in eminently watchable and enjoyable, whether it's meant to be heartwrenching or a laugh riot.