I, too, created an account to talk about the new GUI. But it seems I don't hate it as much as other users.
I don't mind the GUI in a design sense. By that I mean that I like the flat look, though I liked the old look just as well.
I just want to point out the functional cons of the new GUI:
- The title bar is way larger and doesn't follow the color scheme you have set in Windows anymore (Pointed out by many)
- The Minimize, Maximize and Close buttons are not positioned normally, making it unnatural to click on it (-Mirage- also pointed this out)
- The click on the Minimize/Maximize/Close buttons already registers when you hold the mouse button down, making it minimize/maximize/close before you even let go of the mouse button. This is a huge design flaw, in my opinion. It should register on mouse button release!