I don't think the + is really meant to convey any serious amount of padding. If you can make higher clockspeeds, then you should release parts with higher ratings, and corresponding higher prices, not inflate the ratings. I would agree with you that the ratings should not be overly aggressive, and that most reviewers should concede that they are at least fair. But beyond that, it does not make sense to pad PR numbers meant to be interpreted by a mass consumer.
upc