That's just stupid for McD to sue one man.
You can't sue a critic for a bad review. His words are based on his personal opinion. Opinion is NOT fact. If critics could be sued, then there would be no movie critics. Every movie would receive rave reviews and no one would call them the crap they are when they are crap.
On a different note, I think it's nice to sit down at a table and have a waiter or waitress to come up and offer me a menu. And then the food to be nice. In truth, it's only a couple of dollars more at some places.