From my experience, ISTJs are actually the most polite, most disciplined and well-behaved TJs. But they are, I think, also the most conservative TJs, or even type. As for stupidity: I don't know about the other TJs, but I never saw people as stupid.
I think dominant Te gives the person an aura of being driven by it: they just have to plan and execute and do, no matter what. It's an end. My former ESTJ boss was like that: We drafted plans after plans on the flipchart, then he gave it to me so I could realize it, but a month later he totally forgot those plans.
As an auxiliary I think it's more of a means to an end. For me, for example, Te is like a tool. I have my ideas and when I look upon the world I see resources that can be moved and arranged to fulfill my plan, even people. That metaphor of reality as a chessboard fits very well.
As for personal values: yes, that's true. For example, the classic-liberal TJs I know have some values that are far (very far) from the liberal image that they assume themselves to be. In the end, they all want to see it done their way. Even in forums, when the ENTJs say they don't consider their own emotions and just want to see it done efficiently, I just have to roll my eyes.