I agree on the vertical space thing. I would add that lack of contrast between controls is very annoying. That 'flat' look is a pain. Can I or can I not click on this? The one that is a real pain is the disappearing scroll bar. It is there. The space for it is used. But just gone until you hover over it. Then it is clunky to use in relation to all of the other windows controls. The rules for making a GUI were dead simple for MS in the 90s. I had them printed out on 1 sheet of paper and most of that was a couple of pictures.