I remember back a few years ago when I was writing CD reviews for another site. I made no claim to be an "expert," and tried to make sure it was understood that I was just another listener, putting forward my opinion. I always thought of writing a review as a learning experience, a chance to explore why I felt as I did about certain things, sometimes discovering reasons to change from my original reaction.
I was amazed by the vehemence that some readers would attack my opinions, demanding why I thought myself "an expert" and that therefor my opinions were flawed. (Fortunately, there were others who enjoyed my writing.)
The current crop of reviewers would probably be among those demanding my credentials. I don't find their writing much fun to read. There's a pleasing equilibrium in those two statements.