If you want reviews of photography shows you typically have to look into your print media. I suppose the absence of such reviews in the world of blogs is based on the same reasons as the paucity of critical discussions of photography. A noteworthy exception is the blog dlk collection, which, however, seems to focus mostly on larger shows. Another very noteworthy exception is this review on the German blog Fotofeinkost. Unfortunately - you probably already guessed it! - it’s only in German. Shame, it would (and should) serve as a fine example of a really good review of a photography show.