As stupid as it is, though, I'm going to hate losing my Gamerscore...
They're making Gamerscore meaningless next gen anyway, though. A day-one achievement for preordering the console? Achievements for buying a lot of games from the same publisher? Achievements for watching TV? Achievements for purchasing content? Achievements were great... why fix what isn't broken? They took a fragile ecosystem and disrupted it.
I had heard there was a patent for the TV watching, but I wasn't aware it had been implemented. This is also the first I've heard of achievements for making purchases (though I knew about the bonus "pre-order" achievement). If this is all true, it really does kill the nice metagame they had going.
It does make switching to Sony's camp a little bit easier, though.