I agree about the over use, and I think they tried to make it up towards the end, Taylor and Tom and such, but I can't stand how outlandish he made his schemes in the middle
remove free will via burgers
An anti morphing ray (not saying it couldn't work, but comeon; just freaking shoot them already; so much easier)
use crippled andalites as hostages; please, in the beginning he would have, and I say this literally, eaten anyone at his mercy.
He went from being terrifying to a paradoy villian. At times it felt like a complete character transformation to me