You might not be a chef/cook, but if you go to out for dinner and the food is not good, you should have a right to comment on the food.
If you are not a doctor, but you feel that your care was less than what you expected from your doctor, you have a right to voice your concern.
If you have never played hockey before, but are a knowledgable fan and you feel a player is not playing up to his potential, you should have the right to comment on that.