Just got back from Las Vegas and ate @ Rosemary's restaurant. Was very excited after reading online reviews declaring it the best in Las Vegas. I was very disappointed. Some food cold, fois gras overdone, far from strip (not a big deal if food good), halibut entree completely overcooked. It was the same for all 6 people at our table.
Also had the $60 burger at the Burger Bar at Mandalay Bay. Absolutely incredible and worth it. Will go back to have it again.
Chef's table @ Delmmonico's pricey but fun and informative. Good to try once.
Nobu also great. Crowded and noisy but excellent food.