Shuttleworth should realize that a desktop computer with a mouse is very different from an iPad and things that are all the rage for tablets are not necessarily good for desktops.
For example on a desktop you have a mouse which has very high precision and accuracy, whereas on an iPad you have your fingers which are not very accurate at all. Thus, tablets make sure they have few and large buttons, while this is not necessary for desktops. In desktops you are allowed to have more and smaller buttons.
Also, tablets usually have limited real estate so that they make sure any program you use can take up the entire screen. Desktops on the other hand can have huge screens and thus should allow people to have several windows open and visible at the same time.
Unity is cute for the first time but it is almost unusable if you have multiple windows open. I want to see which windows are open so that i can switch between them easily. Unity requires several button pushes to find a minimized window.