I had a memory from my trip to Vegas as a kid of the MGM grand buffet being amazing. I probably should have thought that one through...
Anyway, the buffet itself was distinctly average. The selection wasn't as great as I would have thought and the food itself was simply acceptable. Some random casino I went to in suburban Chicago had a much better buffet which was slightly shocking.
I did leave feeling full and satisfied but in the back of my mind I wished I had tried some of the other buffets I had heard good things about (and have higher yelp ratings). Probably not worth the 36 bucks.