It seems like there will be fundamental changes possibly occurring in the Beta of Windows 8. These are quotes from their latest Building 8 Blog post on the decision for the Start menu.
http://blogs.msdn.com/b/b8/archive/2011/10/03/evolving-the-start-menu.aspx
"Will there be a way to close Metro style apps without going to Task Manager? (Yes there will be, but we also want to talk about why you probably won't need to use it.)"
"Are we going to do anything to make the mouse more efficient in scrolling through your programs in Start? (Yes, we'll improve that experience, and show you much more in the beta.)"
"Some of you have talked about it feeling less efficient to cycle through your recent programs compared to using the taskbar (and we'll have more to say about that in future posts)"
http://blogs.msdn.com/b/b8/archive/2011/10/03/evolving-the-start-menu.aspx