I still can't understand the hoopla around the Win 8 Metro start screen. To me it's simply a fullscreen start menu that has the advantages that
a) it can fit many more default programs/shortcuts
b) it can display more search results
c) it will allow you to allot desktop space to "start menu" space by simply defining where your shortcuts lie
Can anyone really say that they've ever used the desktop while using the start menu?
In short, it's a matter of perspective: the entire Metro screen is the start menu. The only thing I'm not sold on is the mouse swipe to display the helper bar to show it. Pressing Win key on the keyboard is okay, but the mouse version is a bit slowpoke. IMO people's fixation on the orb seems near ridiculous. Furthermore, any argument that Win 8 is a lesser OS than Win 7 is just plain abstract rumbling.
Win+X alone is worth the upgrade for me. It's be come as second nature to me as Win 7's drag-to-edge-of-screen-to-split-or-maximize.
In short - on the surface it's the same OS. It just uses a different start menu system. If anyone can fault Win 8's internal workings, then please go at it. I haven't found anything more wrong with it than with 7.