I'll reserve judgement until i actually see one, but my first thought was "cheap", as in, build quality. That sliding door design looks horrible, but I'm sure they've saved a few Yen by not needing any motors to open a tray or pull a disk in and out. And that's what it's all about - saving a few cents on every unit. Sony and PS3 used to have an air of class around them. You pay more, but you get a better product. Not anymore, it seems.
The majority didn't want to spend $599
Ken Kutaragis model of throwing everything in an expensive box simply can't be sustained for consoles, Sony hurt badly early gen with their console price, even when the competition had crazily expensive accessories, the base price made the PS3 look bad.
This is without a doubt aimed at the casual crowd who don't own a PS3, all of us are simply sitting here pondering whether or not to replace our current PS3s. They've made it cheaper, made a new model which creates a buzz, and will watch sales like a hawk. If it's not moving enough towards Christmas a price cut will be easily done now that manufacturing is cheaper.