5 stars for mandarin oriental in general.
Great Service great hospitality, they really put an effort into making your stay comfortable and making you aware you are staying at a top hotel. Their service went above and beyond. One night, getting back to the hotel pretty late my feet were hurting and i got out of the cab with my heels in my hand, immediately the front desk person asked me if i would like some slippers and came over and slid some fresh soft slippers on my feet. I was SOOO IMPRESSED, talk about going above and beyond.
They also had a nice little afternoon sweets counter by the restaurant, where they had tons of mini decadent desserts waiting for you to forget about your diet!
3 stars for vegas:
For Vegas i wouldn't necessarily recommenced this hotel as there is no casino, i also was a little frustrated with the layout of the hotel, b/c to get the the rooms you had to change elevators at 1 of 3 floors, yea its cool the first time but when you are rushing, or you forgot something in the room waiting for 2 elevators 4 times is kind of annoying. =/
i was also unimpressed with the private event service, i attended a wedding there and the staff doing the wedding was rushed unorganized slow and inattentive.