I suspect it's along the lines of "those who can, do; those who can't, (in this case) review those who can." There are wonderful critics and reviewers who do appreciate the artist and his/her performances, songwriting etc. but will also let readers know if the artist had an off night, or conversely, had a spectacular show. I just think there are a handful who take the term "critic" to heart and feel they have to find something wrong to justify their column space. Then again some are simply bilious twerps.
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