Windows is the epitome of bad window management. It's actually gotten worse as they've removed functionality over the years and broken other functionality. "Oh, you've got a modal window open? Now you can't even move the window that spawned it!" "Oh, you want to move this window to the top of the screen? Let me maximize that for you! Of course we're not going to let you disable that behavior..."

Microsoft got the Start Button/taskbar bit right in 1998 with the addition of the quicklaunch bar, although they keep trying to screw it up. But their window management has been abysmal since the beginning. If you use a large monitor (so you don't need to maximize everything) it's really painful.