We had a reservation at Yama because we had a party of 9 people to celebrate my birthday. When we arrived, we were told we would need to wait "about 5 minutes" for our table (our entire party was present). We ended up waiting well over 15-20 minutes and since there was no inside seating we were forced to wait in the scathing Vegas heat.
All but one persons in our party ordered AYCE. I will say that their AYCE is affordable and the limit is 2 hours, which is nice. But, they never brought out a roll that I requested, even after reminding them when everyone else had their food but me. At the end of the meal, I still hadn't gotten the forgotten roll, but by that point, I was ready to head out for birthday drinks.
Overall, pretty meh. Nothing to write home about and certainly not worth standing out in the 115 degree heat for 20 minutes.