Don't You Hate Scrappy Doo In Scooby Doo Cartoons !!?

Didn't he completely ruin the show. Why didn't they just send him to the pound if they were so tired of his asz. Why do cartoons always have to add characters to the show to try to improve ratings. Also why would anyone waste thier money to go see The Scooby Doo Movies ? Didn't they both suck ?