Have you ever read an interview with
anyone that said during production, "Man, I really fucking hate this project!"

You can find interviews of actors on Uwe Boll films talking about how great the script is!

He probably did watch this with his family and his agent was like, "Well, uh, you could direct the movie or you could start directing television shows." What do you think he chose?
The dude is a noted egotistical jerk - he likes working on his own stuff. The only reason he did this was because he pretty much had total creative control considering its a cartoon property and he still has some fame.