I had heard good things about the buffet at the Wynn so we headed there on the first night of a recent trip to Las Vegas. The first thing we found was a long line, but it moved slowly and steadily. Be prepared to wait at least a half hour though.
The price is a bit higher than some of the other buffets I have tried - figure $40 plus extra for alcohol.
The food runs from fair to good. The seafood, especially the King Crab was good. The crab was sawed in half for easy eating. The prime rib carvery was good too. The pastas and other dishes were not worth the effort. Neither was the desserts. These were mostly more of the same sorts of tasteless mousses and custards that are to be found at other buffets. Decent gelato station if that it something if that is something that appeals to you. Why is it so hard to produce decent desserts at Vegas buffets?
The service at the Wynn buffet was excellent. Drinks were refilled quickly and empty plates cleared. Recommended with some reservations about the menu variety.