I think what Kanter said was honest and from the heart. I can understand his frustration, but he went overboard in his criticism. And you could tell his former teammates took it personally with how they played last night.
The fact is, he wasn't that good in the earlier years. I never was a big supporter of his. But this year, he seemed to have taken a couple steps up offensively. His moves inside now are as good as Big Al's. Quin was trying to have him play stretch 4, which really is not his strength but was needed to complement the skills of Rudy and Favors. I think if he stuck with it, he could've developed into a good 3-point shooter, but obviously his offensive strength is under the basket which fits better with OKC. And his frustrations from his years with Corbin and with Quin asking him to develop a new aspect to his game, it was too much for him to handle.
In retrospect, I think it would've better for Kanter to have gone to Lindsey himself and demanded a trade rather than leave it up to his agent, or worse, demand it publicly as he did. The same result could've happened, only the Jazz probably could've gotten a better return on the trade. It would've been better for his image and relations with the Jazz team and fans.