Four star restaurant? The only internationally recognized star system for restaurants is the Michelin guide, which has a maximum of 3 stars. It really grates me that Americans go on about 4 star and 5 star restaurants
Like the rating system on the web, it's useful for rating all things, not just the highest ranks.
The Michelin guide is also not particularly useful as a global system because it's heavily weighted towards french cuisine -- http://www.urbanspoon.com/blog/14/Fixing-Michelins-French-bi... -- and only serves major tourist destinations outside of europe -- six cities in the US for example.
The Michelin green guide, which is more the equivalent of other rating systems, does use a 1-5 scale.