This would be a great way to see what teachers give their students too many freedoms in class. If you allow students to get away with playing games and texting in class, the students will probably evaluate the teacher with high marks.
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.