Same ol' same ol'
Madness should be lumped into the same category of animation as illWillPress, in that nothing has changed in half a decade, and the author simply reuses old assets from previous films. Normally, you see a progression in an artist's talent after a while. It simply isn't the case with this series.
If Krinkels has gone this long without making something new and original, then perhaps the best thing to do is to just stop and relish the fame he once garnered instead of beating it into mediocrity.