So the rest of the world is unhappy but I'd bet that Ireland is very happy... I'm sure there's an object lesson in there for the rest of the world about taxes.
In some ways, government should operate like businesses as I see nothing wrong with Dropbox (and others) using existing laws to get the best tax rate. Hell, I would do it for my personal taxes if I could and I believe that every working person in most countries would if they could also.