If you are a Whedon fan, you'll enjoy this little gem. If you don't know who Joss Whedon is, you need to get out more.
This short, internet film was made on a very limited budget-namely, Joss Whedon's own money-using friends and family to help him complete it. It was written and largely produced during the WGA strike. Why? Well, a man's gotta do, what a man's gotta do.
The vid is fun and funny, yes. It also has wonderfully appropriate, cleverly written songs. So, singing, jokes, and fun. Well, yes, and then again, Mr. Whedon can't leave anything as simply fun. It also contains tragedy combined with sufficient pathos and a touch of probing insight into the human condition. This qualifies "Dr. Horrible's Sing-Along-Blog a bit more than a simple, goofball musical comedy exercise.
Of course, it works just fine on that level, too. Be sure you watch it more than once.