Scooby Don’t

Someone, please, explain to me why Scooby Doo (the cartoon) is so fascinating. I’ve only watched about five minutes of one episode, ever, but that was more than I could handle.
Please limit your explanation to the cartoon. I have about as much interest and patience for the movie starring that no-talent halfwit Freddie Prinze, Jr. as I do for that Ya Ya tripe.
Thanks, kidz.