Wicked Spoon is one my favorite buffets in Vegas. It's considerably less expensive than some other high-end buffets, and has a great spread of dishes. I like the tapas-style plating, and the variety of cuisines. The fresh seafood station is phenomenal, and I love the oxtail pho also.
Desserts are great and include macarons! I always leave super stuffed and satisfied. Service is great, and basic fountain drinks are included in the meal price. There has never been too long of a wait when I've visited, which included a weekend dinner.
The restaurant is large and there is a ton of seating. It's clean and well-decorated too; I like the lighting and the wooden tables/accents throughout.
Highly recommend, and The Cosmopolitan still offers free parking too.