Slightly better than the first film. This one plays more like a Ghostbusters flick, only with the Scooby-Doo crew present. I'm still not too taken with the overly childish performances, but the monsters are pretty amusing in this one, and there's plenty of different ones to keep things interesting.
The Mystery Inc. gang is attending the opening of a museum wing dedicated to their successes. With the whole town watching, a new bad guy makes his entrance. He has a machine that revives all the monsters from the past, Scooby-Doo and his friends are on the case to save Coolsville from impending doom.
The film is quite loud and hectic, the CG looks a little cheap (probably because it's squarely aimed at kids, but that's just lazy) and the setup is a complete rip-off. But the monster designs are kinda fun and the pacing is hellish, which is definitely a plus for this type of film. Far from great, but somewhat entertaining.