Let me get this out of the way right now, this is one of the scarce few Scooby Doo movies where the ending is a decent pay off. One of the very few that doesn't end with a "meh." And, to boot, the start is totally hysterical. The premise that gets the gang to the location of the mystery is almost too funny for words.

Darn spoiler rules...

I can only assure you that the start, the premise, the reason for the whole movie just out does Shaggy in personality and philosophy in one of the funniest possible ways.

the only downside is that as a big bad, Phantosaur is sort of lame and takes away from the movie.

It's worth ignoring the faults. The jokes, the humor, it's all top notch and for once the ending actually works. The ending is something that will be remembered after viewing.

This is one of the better Scooby movies in the catalogue.