Everybody has a right to criticize anything they want.

I don’t have to visit the Sahara to know that it’s hot and dry there, and there’s no reason I shouldn’t be able to say it’s too hot and dry for me to want to go there.

Someone else might criticize the Sahara for being too cold and wet. That doesn’t make any sense to me, and I can claim that they don’t know what they are talking about, but they have the right to believe that.