Its easy enough to shutdown in desktop mode - just press Alt +F4 however users in the Start Screen and similar Metro interface apps have to dig through the Settings Charm (Win+I) to get to the power button.
You can, however, create a DIY Shutdown button and place it on the desktop and Start Screen.
To do so, go to desktop, right click, and create a new shortcut.
Type in "shutdown /s /t 0" (omitting quotes and using /r instead of /t if you want to restart instead).
click next
rename to any name you desire (you can remove the .exe extension)
right click shortcut and select 'Pin to Start' from the pop up menu.
You can, however, create a DIY Shutdown button and place it on the desktop and Start Screen.
To do so, go to desktop, right click, and create a new shortcut.
Type in "shutdown /s /t 0" (omitting quotes and using /r instead of /t if you want to restart instead).
click next
rename to any name you desire (you can remove the .exe extension)
right click shortcut and select 'Pin to Start' from the pop up menu.