Discount supplements proper usage

I hate when people are complaining all the time without right to do it. What do I mean? Let us start with criticism. People have a tendency to say that something is wrong or bad without being able or even trying to do something on similar level. This usually concerns artists. It is easy to blame them for something but if the same people who are criticizing were supposed to create something on their own they would definitely not be able to do this. The same applies to a situation in which someone is not properly educated and is stating his opinion. For example, saying that some product is garbage without using it, etc. That is why I was really frustrated when I read online the text in which someone was telling that discount supplements are not working and that it is a better idea to spend more money on real supplements instead. That is completely untrue. I am a doctor and I have been using those mentioned discount supplements for years and I can assure you that they are working just fine. I can´t understand why would someone write a thing like that unless he or she is from the competition and wanted to discourage customers of the company producing discount supplements.