none of the guidelines actually addresses this type of comment They do. A significant chunk of the site guidelines boils down to 'no meta' and even address the

none of the guidelines actually addresses this type of comment They do. A significant chunk of the site guidelines boils down to 'no meta' and even address the specific kind of meta in the comments - meta about appropriateness of submissions and meta about the alleged misbehaviour of others. The fact that it's not just your opinion doesn't change the fact that the mods have said this kind of commentary does not, in fact, provide value to them which was your claim. But like tptacek says, just read/follow dang's comments, almost everything gets recycled through there on a regular basis.