I think it's horses for courses.

The best metal band, despite strong tunes and lyrics, would not deliver effectively without a good dollop of stage posing. But it's not what what S+G are for!

However, one of the best metal singers I know surreptitiously leads a double life (he's well under 30) doing morris dancing and folk singing (a huge fan of a local 65 year old woman unaccompanied singer, but she is really rather special) and has just borrowed my spare-est mandolin and dammit was getting music out of it in about 5 minutes! In that persona the stage posing is not where it's at.

What the start of the thread indicates is that a reviewer needs to understand the genre - compare Japanese No plays, or Haiku, or sean-nos singers. The reviewer complained of was no better than the caricature's "I may not know much about art but I know what I like" ignoramus. What might she have made of Schoenberg?