I mean, Scooby Doo was pretty generic as a series in the first Hanna Barbera years, nothing that today you would like but at the time was...a different time.>>118339712
You're right Daphnebro on the first years of SD being trash.
But I wouldn't say that it went good only after Zombie Island.
After Boo Brothers and Ghoul School they started to get better and tried to put many interesting crazy shit that made the movies and series worth watching. Even if Scrappy was a cancer.