Okay, this series is a little different. They couldn't get all the cast together so this series is a sort of anthology, each episode focussing on one character, though as with before everything is connected. Every episode, every story, every character affects and is affected by every other.
When I first watched this series I enjoyed it, but I wasn't thrilled. However, it's in the 2nd viewing (and 3rd and 4th and so on) that I realised that what I was watching was the same old show! It had the same jokes, the same depth, but cranked up another notch! Watch it and watch it again. I'm on my third viewing and now I barely think of it as any different to its predecessors.
Not to mention the fact it's gotten me totally psyched for the movie (which is definitely happening!)