Mark Chang would have cost more money. Heck, they got Scott Baio to play human Foop. Clearly low budget affairs.
And still a heck of a lot nicer than what Disney did to Inspector Gadget. Even the cheapquel of that film was a better film. And need I mention how the execs at Nick ruined the Avatar movie and hoped everyone would just pin the blame on how Shamalan is a terrible director who got lucky three times?
There are things I like about the concepts of the first movie at least. Having Jorgen just break down and say "screw it" and let Timmy keep his fairies as long as he doesn't wish for anything himself, punctuated by the fact that if all of Timmy's wishes were undone, Fairy World would have been screwed. And, despite the illogical of how it happened in the third movie, I like the concept of them saying "heck with it" and just making Timmy a Fairy himself. Though now 20 something Tootie is living with an immortal that identifies as a little boy as a romantic interest. Ew.
Though I have to admit, I can forgive what they did to Tootie because, well... not all awkward girls grow up to be awkward adults. And it's kinda obvious they hinted at the fact they get together at the end of Channel Chasers, as one of Timmy's Kids does kinda look like her. Though, yeah, everything else contradicts that superior animated movie.