People are too hard on this
Sure it's not the original but it definitely stands on it's own. It keeps the tone of the original but manages a completely different pace. If anything, it's too short. The return of some characters is nice but it REALLY needed a matthew lillard cameo for the best fan service possible. I think he is trapped in scooby doo purgatory.
This one won't be remembered as fondly as the original but it's far from a bad sequel. It might also help that I went into it with rock bottom expectations being a big fan of the original. The minute I saw there was a sequel I didn't even want to give it a chance. I'm glad I did though. It's worth the hour it takes to watch.