I'm about eight episodes in. I'm really enjoying it. The explanations of and arguments about basic political stuff has been a little tedious a couple times, but overall it's good. It's interesting the way this show balances the episodic and the arc plots. Their personal stories (Sam's call girl, Leo's divorce) are allowed to evolve over at least a couple episodes. The political plots are more episodic. The team faces some political obstacle or national emergency and deals with it in one episode, like cops would solve one case per episode in a police procedural. Even the promised war with Syria only lasts one episode.
I'm interested to see if that changes over the course of the seven seasons, since over that time shows like The Sopranos changed what people expected out of television. I'm interested to see if some political battles start lasting multiple episodes or a full season, which is how most good shows work now.

I'm about halfway through season 4 right now. I love this show.

Watched the first three episodes last night, pretty good stuff. I watched this show sparingly when it was on, but it was so long ago and I was so young that I really dont remember anything about what happened, which is nice.

I'm around ep 18 or 19.
I feel a little guilty about saying this, but I love this show. It's the only thing I want to watch, and I want to watch it all the time. The only reason for the little bit of guilt is how silly the show can be sometimes. The policy debates are often too basic and I often find myself thinking that major plot points aren't logical. Great show, though.