This place is too stuffy and formal for Vegas.
I went here to dine with a few close friends last time I was in Vegas and we just felt uncomfortable the entire time.
My friend decided to wear a polo shirt and shorts which apparently is a huge No-No; the hostess gave us a stern warning and told us that normally we would not be allowed to enter - but she made an exception this time. She should've added that along with the one-time exception, the wait staff would up their game accordingly, to make the dining experience that much more uncomfortable.
We were seated, at which point we met the most bizarre waiter I have ever encountered. He had the personality of a finely polished ball of Italian marble and seemed entirely unable to relate to any type of human experience. His main goals in life seemed to be to bask in the glory of a 200 lb wheel of Parmesan cheese that he brought to our table; and get us out of the restaurant as soon as possible.
Our waiter asked for our drink order immediately and either did not understand the concept of a drink menu and/or was extremely put out by having to bring it to us before we decided on drinks. Based on his.. personality? I think it was more the former.
I'll add one quick thought on the food: Good but not worth the prices they were charging - especially with this incredibly bizarre service and stuffy environment. Also, I guess my veal marsala was "too refined" for a side of noodles or any other type of side dish accompaniment.
I should add that Il Mulino also has "captains" which apparently are some type of waiter team leader. Captains also fully expect a tip - as seen by a tip line for both our waiter and the captain. Good luck on how to tip in his fashion as we had no idea.
I would only recommend this place to amateur social scientists on the off chance that you might get our waiter. Watching him interact with humans - as if it was the first time ever for him - was a truly unique experience.