For my tuppence worth. Pilots/Atco's are highly qualified professionals, for unqualified peoply to make comments/criticims on their work should not be allowed. I fell out with a spotter once for making remarks towards me. I knew the chap through the flying club who made comments from listening to the r/t. He was not qualified to comment on the scenario nor had a real picture of the situation just from listening on the VHF.