I feel the problem with scrappy is that he is one dimensional I mean yes the other characters are as one dimensional as cardboard but it's just I feel like in a way he was just Cousin Oliver. A marketing plug oppose to a real character.
Just like Jar Jar Binks Thats what I understand from the criticism anyway. I don't think the character is that annoying. I just think they could have done a little more with him.
I made the Rick Mirer analogy simply because Scrappy's appearance initially caused a major spike in ratings. However, I think even a casual observer could see this as a desperate attempt by Hanna Barbara to recapture the show's popularity.