My partner and I went to Lotus of Siam while we were visiting Las Vegas, and overall, I thought that it was inventive Thai food, but it was overhyped.
I did not handle the reservation, but I was told that it was difficult to get. Basically everybody in Las Vegas knows about this restaurant, from the TSA agent to people working at the hotel pool. The new location is rather large.
We had a 8:30 reservation for Saturday night and apparently that is one of the last seatings, because only one other table after us was sat. The restaurant slowly cleared out once we got there, but it was packed when we first arrived.
The menu is huge and overwhelming, which is not great. I would prefer a restaurant just specialize in a few choices as opposed to literally anything that is made in Thailand or Burma.
We asked for waiter for recommendations, and he was knowledgeable about the dishes. He recommended a green salsa, which was too spicy and over done. (The presentation was nice though.) The softshell crab was the best dish in my opinion, and they source it from Mexico. I did ask where their shrimp was from, considering all the human rights abuses with Thailand shrimp, but they also come from Mexico.
Rather abruptly before any food arrived, he informed us rather urgently that the kitchen was closing and that we should put in any orders for food now. I felt kind of rushed, and because of all the hype I wanted to try more food but I didn't know what I already ordered. That caused us to over order - at 9 PM on a Saturday night. Way too much food because you can't tell dish size when you order.
Overall, the food was above average for Thai food, but there are two Thai restaurants back home in Washington DC alone that I would go to before this one. It didn't match the hype.