Although there a lot of Thai places around Las Vegas, I am still looking for my one place that I can always count on. Krung Siam is ok, but not sure it is my favorite of all places. The service was ok - it was not a busy night and they somehow managed to not get our order correct, even though the server had repeated what we wanted.
We ordered the yellow curry with tofu, beef drunken noodles, and the spicy chicken wings. The flavor for all of the dishes were good, although for medium spicy, it felt like it was more mild. Each Thai place is very different as I have been to other places that their mild was more like hot. I wish the restaurants were more consistent. For the price, the portion sizes were decent, but not huge. They also charge for extra rice.
The one good thing is they do have happy hour drinks/beers - so go before 8p and get your pints/pitchers for a great price!