So much awful. Bad font rendering. Icons look pixelated. White semi-transparent things look weird. Active and inactive windows look too similar. Instead of just

So much awful. Bad font rendering. Icons look pixelated. White semi-transparent things look weird. Active and inactive windows look too similar. Instead of just coloring in the window buttons greying the text there should be some more obvious visual change to the actual header. Curve in top of window is pixelate. Very rounded top and share hard rectangle is jarring. Dock is perfectly rectangular with no border. Icons are bad. On the interface side the global menu is not only a mediocre UI when universally implemented its unlikely to be properly implemented in countless apps making impossible to make consistent.