The worst problem this movie had was that it failed to remain faithful to the original idea and instead created practically brand new characters that just happened to have the same names as the ones that appeared in the cartoons. The casting was just as bad because the producers tried to capitalize on the fact that Freddie Prinze Jr., Sarah Michelle Gellar and Matthew Lillard are all close friends in real life. They failed to realize that nobody cares so they ended up with Prinze, who can't act to save his life even in a children's movie, and a woefully miscast and misused Gellar. So much for her budding film career which she needs to depend on now that Buffy's over. The screenplay itself is not just insulting to Scooby fans but it's also insulting to the intelligence of any audience of any age (the lame "surprise" twist at the end proves it).
Skip this and watch the much more amusing and entertaining episodes of Johnny Bravo and Harvey Birdman: Attorney at Law that featured spoofy guest appearances by Scooby and the gang. The writers of those two Cartoon Network shows knew how to parody Scooby Doo all the while remaining faithful the original concept. They were fun to watch even if you weren't a Scooby fan. The creators of this film could have learned from them.
Skip this and watch the much more amusing and entertaining episodes of Johnny Bravo and Harvey Birdman: Attorney at Law that featured spoofy guest appearances by Scooby and the gang. The writers of those two Cartoon Network shows knew how to parody Scooby Doo all the while remaining faithful the original concept. They were fun to watch even if you weren't a Scooby fan. The creators of this film could have learned from them.