This is definitely not the number one buffet in Vegas. This buffet is not too bad but the better one would be at the Caesars. Caesars buffet has more choices and they are about the same price so overall you do get more value at Caesars. In terms of the dining atmosphere, this might be a little better in terms of interior design and it has just a bit more fine dining experience to it. We also tried Wicked Spoon but still prefer Caesars over it.
I'm a seafood lover and Caesars definitely offers more seafood options. Caesars has both cold and warm crab legs where the ones at Wynn are only available cold and they are way too salty. Also Caesars offers fresh oysters which Wynn does not offer.
We find the overall quality and the taste of choices better at Caesars. The Chinese section at Caesars buffet offers way better choices and tastes over Wynn. Overall, we find that Caesars tops Wynn in almost every section of the buffet.
If you're at Wynn for a show, I'd say go try it and see if you like it.