Really very few people would call Dragon Ball Z Kai on Nicktoons horrible after seeing the CW4kids edit. Really people thought Kai could not be edited more after Nick got their hands on it but then cw4kids went and did that.
Anyways I have defended Kai on Nicktoons from day one just like i defended Naruto Shippuden on Disney Xd from day one. Were both shows edited more then they would have been on Cartoon Network? Yes but are they over edited and given pointless changed. My personal opinion no and so I can still defend them.
Though you know GT seems less edited then Kai on nicktoons did. I don't remember the Cartoon network edited version so I have to ask is nick just airing that edited version or did they edit it further? Really I don't remember. Though it would not surprise me if it's the same version that aired on Cartoon Network since that's what Nick did when they aired the movies.