I wouldn't say Ocha Cuisine has the best Thai food in Las Vegas, but I will say it's pretty darn good. The thing I like best about this restaurant is that it doesn't close until 4am and in the wee hours in the morning, they do have the best Thai food around.
The staff is friendly and courteous and anyplace that give me free refills on thai tea is alright with me! The restaurant is clean and well lit. Also, it's in a good location. Not many seedy characters running around, aside from a prostitute or two walking the side walks of the strip, but they leave you alone. :)
All kidding aside, I gave Ocha three stars, but really it's 3 1/2. The food is pretty dog gone good and a great place to hang out late at night.