There are a few reviewers whose reviews I would respect, whether of concerts or CDs. They are usually honest, sometimes to the point of being harsh, stay on the subject of the performers and the music, and don't wander off at airy fairy tangents or litter their reports with irrelevant quotes and speculation. I'd put in this category people like Jim Gilchrist, and a couple of others who write for The Scotsman newspaper (so brilliant that their names escape me right now!).
Then the CD reviews in "Living Tradition" magazine are probably on the whole better worded and the music better understood by their writers than some published elsewhere.
But there have been times when I have attended a concert, then read a review of same, and wondered if the reviewer had actaully been at the same event!