Plenty of mechanics complain that cars are more complex now
The major annoyance here is that MS designed a Tablet/Touchscreen UI, and stuck it on a desktop OS that lacks a touchpad.
Tablets aren't frequently powered off and never logged off, so MS split the Logout/Shutdown menu into two and hid them in separate places. That was aggravatingly unnecessary and annoying for the desktop version of the OS UI.
Metro apps are full-screen, and you switch between them by swiping your finger left to right on the screen. What if you don't have a touchscreen? Alt-tab doesn't include Metro apps. Oh, stick your mouse in the upper-left corner. That makes sense.
Since Windows 95, the Explorer shell has been reasonably consistent and familiar. With 8, MS switches everyone to a tablet-oriented interface. But how many users will have MS phones and tablets to build familiarity? How many workarounds will users need to learn to deal with using a touch-based UI without a touch interface? Why didn't they include Mouse Gestures of some sort?