It is proper Netiquette to post positive messages and advice. Don't post critical comments.
Music networks are supposed to be fun. Negative is not fun by definition because fun is positive. Negative is the opposite of positive. There may be some room for constructive criticism, however, criticism in general is considered discouraging.
Critical comments on music networks detract from the network because they discourage content generation. Compliments encourage artists to create more music. Criticism is negative. Compliments are positive. Constructive criticism is a neutral when given properly.
Don't post critical comments because it discourages network participation.
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