I honestly didn't know what I was getting myself into when I first sat down at my computer to watch this. I had heard that Joss Whedon had created it, and I was a fan of the Buffy the Vampire Slayer series, but I didn't know what it was about or anything.
Forty Five minutes later, I was completely blown away. The songs, writing, and acting are just amazing. It made me laugh, and nearly cry. It's so creative, and has superheroes in it, which I love.
If you're someone who isn't sure about it, just watch Dr. Horrible's Sing-Along Blog anyway. I promise you will not be disappointed.
Dr. Horrible has a P.h.D. in horribleness, and awesomeness.