From what I've read it achieves no detectable improvements, and in some places can bring out worse problems causing people to amplify themselves to reenforce eg

From what I've read it achieves no detectable improvements, and in some places can bring out worse problems causing people to amplify themselves to reenforce ego (and vice versa become nastier to push others down to achieve the same goal). So it just becomes a pissing contest more than a credit score.