Highly rated Ethnic Asian dining establishments in Las vegas
Certainly Lotus of Siam would be at the top of the list. For Chinese, do a board search for Chinatown. Lots of good but not great Chinese all along Spring Mountain Road, including K.J. Kitchen which I mention specifically because of their branch in the Rio. That might be the best of the bunch, but it's also quite a bit pricier than its Chinatown brethren.