The thing about this anime is that it is actually REALLY really bad. It bombed in Japan and it is easy to see why, the time this was released, there were so many good anime out that blew it out of the water and this anime doesn't do anything special. It tries to be Scooby Doo and also the cliche's and bland characters really hurts this show.
Aniplex was handed the English dub of the show, knowing it was a failure in Japan and probably would be a failure here, it SEEMS they didn't take the dub too seriously. So what do we get? The best dub that has ever been done ever.
Let me try to explain; the show has so many logical fallacies and strange lip flaps, the voice actors decided to add really adult and funny jokes, often breaking the forth wall and mocking the show itself. It's like a fandub with comedians or an Abridged series, but full episodes.
The animation is poor, the story is thin and a more like villain of the week episodic series and the environments and sound designs are really really bland, what saves this show is the English Dub ONLY via Aniplex.
My advice to you is to watch the Dub, if we were basing this show on its sub in this review I would tell you to send this show to the closest pit of fire and exorcise the demons out of your house, but the English Aniplex Dub is a MUST see. Bare in mind the adult humor may be offputting to younger audiences.