Definitely a good show. It genuinely feels like Sorkin took the best elements of The West Wing and Sports Night and blended them together. The acting is top-notch, particularly from Amanda Peet, Matthew Perry and Bradley Whitford. The rest of the players are also outstanding - not a lemon in the bunch, down to the characters with just one or two lines.
However...
I certainly hope this isn't the show NBC is counting on as their big saviour that can take them out of fourth place in the ratings. It seems a bit too cerebral when compared to what's been working on other networks like Lost, Desperate Housewives, House and Grey's Anatomy. Definitely not a flashy watercooler show. In fact, I think it may have difficulty finding a large audience, for the same reason that two other excellent "behind the scenes" series (Action and Sorkin's Sports Night) never found mainstream success.
I hope I'm wrong.