Best Episode: Tempus Anyone?. Worst Story: The Clonesia Arc.
A great season with some real highs and lows. When it was good it was fantastic, when it was bad, it was just awful crap for a whole five episode arc of hell. Overall though, it was brilliant, a masterpiece of a season. I very much look forward to Season 4, and actually seeing episodes that I have never seen before.
Score for the season: If it weren't for the wedding/clone/amnesia arc thing, I would give this season an 8, but as it is, I'm going to go with 7/10.