Hubby said the same thing (i.e that it was very typical Whedon), but I found the plot much thinner than his usual. There's a reason why Serenity is his most notable failure so far--he's meant to be working in a long-term, serialized genre where he has time to work in his dialogue and quirks and still get the story out. I found Dr. Horrible very funny, but not very satisfying, and I usually find Whedon more satisfying.