I don't mind the look too much but I do hate the all ajax navigation that gratuitously breaks the back button.

I also don't like the fake scrollbar and the arbitrarily small content window that wastes half of my window height--I've got a large screen, I shouldn't have to look at your content through a peephole.

I personally like the muted colors and lack of gradient/round corners/drop shadows everywhere but I can see it being criticized as "too plain". Minimalist doesn't == good design, necessarily.