It's interesting and surprising to me that so many like the look of this. The fonts look grainy. The widgets are blocky and crude. At least, that's my take on the aesthetic. To each his own, I guess.
It's less that it looks nice and rather that there isn't anything surprising. No scrollbars that only show up when you mouse over them, buttons without borders, horizontal lists that aren't obviously a scrollable list... the list goes on. :)