I do think that Le Cellier, like any other restaurant is going to get things wrong occasionally.
DH and I ate there last September. We both had the cheddar cheese soup, I liked it, DH wasn't that fond of it. We both also ordered the filet steak and his was so wonderful, tender, could have cut it with a fork. Mine, however, was horrible, could barely cut it with a knife and had to send it back. They were good about it though and offered me anything I wanted.
But in general we loved Le Cellier and one bad steak (which I consider unlucky on my part!) won't stop me going back (not to mention their Cappuccino Freezes which are DIVINE!!!).
Sorry you had such a bad meal.