Pretty much the same thing here with more nasty looking CGI and even more terrible looking general effects, sets, stunts and obvious stunt doubles. The cast perform a little better here, more of a natural flow with this one, they gel better and actually come across as 'Mystery Inc.' with more success than the previous film.
There is still a heavy load of very childish toilet humour going on throughout unsurprisingly. This still isn't required as it wasn't anywhere to be seen in the original cartoon so I have no idea why the powers that be seem to think its necessary. On the plus side its nice to see a few ghosts and ghouls from the original cartoon used for the plot, always did like that deep sea diver ghost.
This is the films only plus point, despite relying heavily on CGI as per usual it was nice to see these old spirits. There were some live action costumes used combined with CGI which didn't come off too badly admittedly. This did give a nice light-hearted ghoulish 'Casper' vibe which saves the film from total ruination. The quality does vary a lot though, some ghosts look quite eerie and well realised, whilst others looks down right puerile and highly fake.
So the inclusion of a nice array of phantoms and spooks slightly elevates this above the first film but its still quite awful. Not as many cameos but still plenty of unnecessary pop culture and some God awful music tracks. Again, stick to the original cartoon for all you're haunting needs.