This movie had a lot going for it. The voice cast, sound effects and smoother animation felt more like the original Scooby Doo and I appreciated the classic feel. I really liked that Scott Innes was not voicing Shaggy. Velma is good for relating some good Mexican history. The behind-the-scenes, blooper reel and cast commentary on the DVD are great! There were definitely parts where the plot was interesting and a lot of vintage Shaggy/Scooby comedy that made us all laugh.
That being said, the plot didn't hold together very well for me. Somewhere in the middle, things get a little TOO confusing and far-fetched, even for Scooby. The story seems to slow down and then jump ahead making the movie lurch along awkwardly. Daphne's voice seems slow and... old! The dialog really dragged in parts. The extra characters didn't have much personality or add interest to the movie, they were just... there.
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Overall the movie was OK and my kids enjoy it now and then. Not the greatest... but pretty good