Rocks Off is not going to lie. The prospect of getting into concerts for free is what leads many people to become music writers/reviewers in the first place. Though it's not true of everyone, we've generally found that with experience comes plenty of practice in the art of grading on a curve.
But not always. Buy enough bananas and once in a while you'll get one that's rotten. Some concerts just plain stink. Why not ten? We just couldn't stand the smell.