Wow - I'm glad I abandoned MR last year and stuck with SPG.
This is a serious devaluation! What adds insult to injury is that it was painted as an enhancement! How very US Airways-esque!
At least SPG is honest ... When they bumped a lot of hotels up a category, and even created a new higher level of hotel and therefore devalued points, Starwood Lurker stated it in those words. He even encouraged people to book before the changes went into effect.