Lots of posters here must just HATE eating in restaurants in Europe. Where their ability to judge - and more importantly to them - let the people who serve them KNOW they're being judged and compensated not according their employers' desires, but by THEM. In a no-tip system, your little notes on the Bill are cute, maybe, but that's it. Not worth the time.
I wonder if these posters also wonder why they get treated rudely in French shops when they ignore the FIRST rule of French etiquette - greet the people serving you as you enter. Yes in the US it's the clerk who is supposed to greet the customer. But it's the opposite in France and if the French feel you're being rude, they can out-rude any American any day.