I like it enough that my laptop is now running solely on Windows 8, and coming from me that should be a hefty statement. Now that said the biggest irritant to me so far? The difficulty of shutting the machine off. There is no power button or shutdown options that I can find. The only way I know to turn it off is to hit start, then on the new interface click your name, then hit logout. Then click the screen, then go to the power button there.
Edit: I'm an idiot. Right pop-out -> Settings Wheel -> Power button