I got to say, that this place is one of the best buffet in Vegas.
Located in the Rio Hotel and Casino. Carnival World Buffet has a wide selection of food to choose from. From the usual American food, to Mexican food and Asian food. There's something for everyone to enjoy. They even have a bar inside for those who probably prefer a bloody mary with their food. The dessert bar was nice, but I do wish they had a bigger selection.
I'll probably admit, the pricing is up there, but with the selection of food and all you can eat. You can probably eat more than it's probably worth. The food was decent, and seating arrangement were easy to get in and out of.
Overall, one of the best buffet in Vegas I've been to.