I think the original early 70's series Scooby Doo Where Are You was the best Scooby Doo series. But I think the direct to DVD movies of the last decade and the early 00 WB series were more true to the original series, than those mid 70's to mid 80's series. And anything without the annying Scrappy Doo is a plus.
The one mystery is never sholved in the original series, where was the laughing coming from? LOL
I am a born again Scooby fan, and I am getting the original series on DVD.
But I don't like any Scooby movie or episode of series in which the monsters or ghosts are real. They have to be people in masks, the point of the original show is to tell kids monsters and ghosts, etc. are not real. When they are real, it loses its original purpose. I remember the later series in the early 80's Fred, Daphne, and Velma were not in the cast. What is up with that?