Here's a quick breakdown of my somewhat unconventional (mainly the first-place choice) feelings on DS9:
7 > 5 > 6 > 2 > 4 > 3 > 1.
Sorry, I'm from GameFAQs. We rank things for a living, it feels like. Anyway, they're all solid to me except the first year, which is passable but shaky. Third season being the weakest overall is definitely not something I can get behind.