For example when using swipe gesture to move between the spaces i hate that windows in the space i'm switching to are out of focus and then when i already switched they are focused. It looks like blinking. Hate that. It's so unpolished. Or the way it works for example. Why drag all desktop with menubar minus dock when it looks much more slick the way it was in Leopard and Snow Leopard when desktop stayed in place and just application windows moved. HATE THAT black separator in between spaces. Very unpolished.