I did like the Rosencrantz and Gildenstern approach to that View from the Gallery episode. Mostly, I just didn't care for the new station commander or the telepath rebellion nonsense.
I really enjoyed Firefly and Serenity. I wouldn't rank the crew higher than my holy trinity of Kirk, Spock, and McCoy, but still found it worth watching. Would I put it above Babylon 5? Certain seasons of B5, maybe. One nice thing about the brevity of Firefly's existence is it didn't get bloated...