This is actually one of my biggest pet peeves. Actually the whole MA thing in general annoys me. They are not held to the same standards by a governing board as nurses, they do not have the same education, and because they are paid less they are more likely to be hired by a doctor's office. Actually I know of many doctors offices that ONLY hire MAs!
I do not give the orders, but I do have to follow/enforce them. This is something that you should take up with your doctor. i used to tell my patients I don't make the rules, I just complain about them. It usually broke the tension of whatever they were complaining about.