I don't know why, but this show is my all time favourite (yes 100% equal to Futurama). I believe that it is mainly because of the characters. I care about them, they are great and funny and the actors are amazing (especially Ginnifer Goodwin- come back, Ginny... anyone else thinks she's truly brautiful? -I do.).
It provokes thought and is clever, funny (with sarcasm - yay!
With some shows (like Friends and Simpsons) I don't really care what happens to the characters as long as it's funny. But in Ed, I want what's best for them (also in Futurama)...