As great as this might be, how do you determine who's a great teacher, and how do you hire people based on it? Answer, you do not. So unless you know cold that someone is a great teacher you should stick with smaller class sizes.
Maybe. But if you don't learn anything and score poorly on tests compared to other classes, I don't think the teacher that gives freedom will be very liked. If the teacher can't control the class and student are having "fun" and it's chaos all the time, I still doubt he will get a good evaluation. If texting doesn't really impede on the learning, then why not text. I don't see a big difference between texting and doodling. I might be too optimistic regarding high-schoolers but I think if it's explained well, they will answer truthfully and the good teachers will still get the best grades.