Yeah because everything that our main protagonists do is pretty much shit. They don't explain to the parents that Grim is their slave.
They actually can't even explain why so much evil shit happens, and they don't even talk to Irwin that Mandy isn't interested.
Grim Adventures of Billy and Mandy is basically about three assholes who basically fucks over people on a constant manner. But it's funny, and I gotta give Adams credit on his shit. He can make a villain into a funny fucking character. Who the fuck can do that so splendidly?