Probably Joseph Lai.
Now, keep in mind, I actually enjoy his films. (I've never actually seen any of the live action ones, but I hear they're pretty similar to the ones I have.) But it's not for any decent or honest reason. It's because they're so awful it's like a clean substitute for taking drugs. I mean, look at this. Just look at it.
Among other things, this "movie" features guys shooting at stuff in such a way that you can't tell if they're actually shooting at anything. And that's before the "action" starts. When we get to the "action," the kids (who, since it changes from live action footage to animation, change from Korean kids to Caucasian kids, and one appears to have gotten a sex change, and they all before the change had helicopter transformer toys, possibly as foreshadowing) step out and start calling the helicopter-like spaceship a plane. Shortly thereafter, one of the kids kills a soldier by hitting him with a slingshot, causing him to drop a grenade at his own feet. Then, the helicopter/plane/spaceship, piloted by green, blond/redhead kids from outer space, transforms into a giant robot and kills all the other soldiers, shooting down their helicopter when they try to retreat.
And then there's the green alien dictator of North Korea.
That, sadly, doesn't even go into the blatant editing and animation errors which run rampant like a drunken, irate Godzilla, or the awful dubbing. (One of the films, Space Thunder Kids [mentioned in the post linked earlier], actually had halfway decent dubbing [only halfway, mind you], but it was actually made up of about eight different films seemingly hacked together using a machete and probably masking tape. That's right, they didn't even bother forking out for duct tape.)