Yes, it's famous. Yes, Bobby Flay is a celebrity chef and could open up a McDonald's in the ghetto and people would line up in droves - but luckily, that's not the case with Mesa. The food here is fantastic. The portions are large, and it's reasonably priced for Vegas standards.
We came here on a Saturday night after a show, and even at 9:30 PM, our reservation saved us a pretty long wait. Started with the tiger shrimp and had the lamb porterhouse chops for the main event. The wife got pork tenderloin and loved it even though she hardly ever orders meat. The lamb was also very tasty with a serrano sauce that gave it a kick that one would expect from Bobby Flay.
Overall a great meal in a great atmosphere for a good price. There a lot of options for famous chefs' restaurants in Vegas, but Bobby Flay has got a great thing going at Mesa, and for my money, it's well worth the trip and a must try.