I've yet to see a good one. And even if: how you do something is often as important or even more important than that you do something. And on the 'how' bit the board just utterly failed. This is the most watched company in the world right now on the tech front, you can't just oust the CEO without a very good plan. If you do that kind of thing on a whim you are not fit to serve on the board of any company, but especially not on the board of this one.