Mozen Bistro is Mandarin's casual restaurant that rivals amongst some of Vegas' fine-dining restaurants. Especially when it comes to service, decor, and atmosphere. As with nearly every other review on Yelp! about Mozen, you'll find consistency and excellence in the food and service. Mandarin Oriental prides itself on great service, and Mozen doesn't disappoint.
Mozen is located on the lobby floor which is Thirty+ floors up. It's quite different, but a refreshing experience to get there. The dining room allows for some great views as a result.
The food itself is delicious. My friend and I shared the Turkey Club and Kobe Burger. Both were large portions and everything was cooked perfectly. The prices were decent given that you are in Vegas... and at the Mandarin. But I'm sure that they would be able to increase foot traffic tremendously if they lowered them a bit.