I eat there regularly.
I'll tell you why. It's fairly affordable (there's only one set menu of 6/7 small courses and it's 45€ - no you can't choose what you eat) the decoration is totally bland (typical French brasserie with no fancy stuff at all), there's no maître d', no need to book it weeks in advance (although you might have to wait at the bar if you didn't), the room is pretty loud... All in all you'd find nothing in there that you'd expect in your regular michelin star joint.
Oh, the wine list is pretty neat and the food is just magnificient. Some of the best meals I had in my life. I know a couple of other places like this in Paris which I hope will not get as much attention as this one.
Bottom line is : if you're ever in Paris go eat there.