>>936048
With Ghoul School I don't think it was a failed pilot but it does feel like that. If anything, the Scooby characters felt like they didn't need to be there. They had all these original characters and a pretty interesting setting, it really could've been it's own thing.
I only vaguely remember Reluctant Werewolf and I do not recall seeing Boo Brothers, but from I can tell Shaggy and Scooby sound more involved in those.