First, it doesn't matter whether the page is made with tables, divs, or strawberry marmelade - the user will never know.
Second, don't think that just because something looks like it wasn't designed that it isn't. A large part of googles success lies in its simple design, bordering on the naive. Don't think that this isn't intentional and that a lot of hours haven't gone into designing it.
It's a recently launched web application. The layout is just one huge <table>. There is no design to speak of. Probably because none is needed.