The plots are interesting and creative, the characters are likable. A lot of the jokes use adult/crude humor, thus making the show not for children. Oh, and it's very funny!
Stating your dislike for this show can often result in fantard overdrive. Also,mispronouncing the title Foster's Home for Imaginary Friends' can also bring in mass fantard overdrive.
Bloo: I'm going to do something to prove that yet again I'm an asshole but since I'm the star of the show, people will like me regardless.
Mac: Isn't that what you did LAST episode?
Bloo: Yes, but this is Foster's Home for Imaginary Friends and no one will notice if the plots are repeated! WE'RE ANIMATED IN FLASH!!