This show is so much like "The West Wing" that it's uncanny--and it's not even that there's tons of recycled actors (well, four, that I noticed) but it's the timing, lighting, dialog, it's all the same. It triggered the same receptors that "The West Wing" did. (I haven't watched too much "Sports Night" but its feel as a half-hour show was very different, and generally more brightly lit.)
The thing is, he made working on a sketch comedy show seem as important as working in The White House. You're watching it and you're feeling the characters are doing important work, and then you stop and say, "It's a show about making SNL, and that isn't even any good anymore!" But when I let myself get carried away with the gravitas that Sorkin inevitably bludgeons you with, it was really good.