Some don't like his language, or the yelling, but he realizes that if people are going to drop big $$ on a meal, they better get quality service/cooking.
I'm impressed by the fact that he isn't a food snob- he appreciates soul food in a funky joint as much as a fine French meal at a 3 Michelin star restaurant. One of the only times I saw him clean his plate was when he ate barebecued ribs in a Brighton restaurant run by an American ex-pat. On the other hand, he regularly lambasts self-absorbed chefs who prepare inedible pretentious crap.
He's a perfectionist when it comes to cleanliness, freshness of food and respect for the customer. He's doing something right- his restaurants have earned a total of 12 Michelin stars.