Okay, all these inter-office politics aside, I don't think Season 16's hatred is really justifiable.
I mean, no, the animation is not fluid or anything like Cinar/Cookie Jar, but at least 9 Story is making an attempt to replicate the entire style of Arthur, both in the character designs, and the overall production design (backgrounds) and such... this isn't bad, considering that other cartoon series that have switched production companies have been changed COMPLETELY... case in point: Dexter's Lab. After Dexter finishe its initial run, Cartoon Network renewed it, but creator Genndy Tartakovski was working on other projects at the time and couldn't do anymore Dexter, so it was given to someone else to do, who changed everything: the way the characters look, the style of the show, and even the character's backstory (they completely changed how Dexter and Mandark met, and even made him "evil" because of an oppressed childhood at the hands of his hippie parents). Similar with The Chipmunks, they went through three different animation companies, the last seasons of the show, the animation was very off-model and simplistic as well as the style of the show.
So, all things considered, I really don't think 9 Story deserves a whole lot of hate, because hey, it could be worse.