You know, I wondered if there is any such thing as too fast, and I glad that you responded to this, because when I look at our 'fast instructor' she brings it to such a level that it makes you think you should be striving to go that fast as well. And she gives no indication that there is any such thing as 'too fast', so all us newbies are left thinking that is what we are supposed to emulate.

You are correct as well - very few instructors let you know if you are doing anything wrong, or if you are new, give you pointers. When I was in my first class, it was with the first guy who helped me (I arrived early and asked) - he told me how to adjust my bike, and how to hold the handles properly when in certain positions, etc. After that, I went on spinning.com to get more instruction.