I'm interested in why you think only one menu bar is a bad thing. In my experience it makes it easy to use. On Windows, a menu bar is maybe 20-50 pixels high, and you have to hit that small target to use the menu bar. On Mac, because the menu bar is at the top of the screen, it has effectively infinite height, and I can get my mouse into it with a quick and imprecise motion, which is ideal.
