I saw this on its theatrical release mainly out of morbid curiosity really and even back then it was pretty damn poor. About the only thing they got right in the film is the casting of Lillard for 'Shaggy' who seems to have been born for the role. Rowan Atkinson must have been bribed with tonnes of cash to star in this crap.
The rest of the film is a terrible mess of horrendously bad CGI, unfunny attempts at humour that even the kids would roll their eyes at and a very shoddy look and feel all round with obvious sets and cheap costumes. This classic creation has been dragged into the modern age with various hideous modernisations including your obligatory rap/hip hop soundtrack that seems to come with most kids films these days for some reason. Alongside so many other god awful scenes it no longer bares much resemblance to the original cult creation.
I dunno why they couldn't go with a more sensible approach and a slightly more genuine ghost story. The cartoons were silly yes but still reasonably coherent and actually quite spooky for kids, but spooky in an enjoyable way. This film is basically just trash...and since when was 'Scrappy' a bad guy?!.
I mean seriously, could you possibly cast anyone more inappropriate for the role of 'Fred' than Freddie Prinze Jr?!!. Was he cast because his name is Fred too?? for Gods sake lets try and make an effort people!.
As usual with so many film adaptations these days, stick with the original material. This whole venture just feels hokey and uncomfortable from the start, it could be an OK movie but drowned in vacuous pop culture references and needless cameos makes a mockery of the entire idea.