Watch out! The "Buffet of Buffets" isn't a single place, or a chain of identical places -- it's a collection of 6 different buffet-style restaurants on the Strip. It seems to be pushed as a package deal with hotel offers (e.g., get a room for 2 nights and get vouchers for 2 meals at any of the 6 buffets). If it were up to me, Buffet of Buffets wouldn't get a listing on Yelp at all -- only the individual restaurants would.
If you go to the address listed here for Buffet of Buffets, you'll be at Harrah's, and the buffet there is called Flavors. As I write, Buffet of Buffets has a 4.5 star rating here on Yelp, which piqued my interest; but after going to the address listed and finding out it's just Flavors (and trying Flavors -- see my 1-star review @ http://www.yelp.com/biz/flavors-the-buffet-las-vegas#hrid:B2-LbPrmCSBbpjpMAnHAZA), I really wish I hadn't been tricked by the Yelp listing into thinking I was going to get a nice meal.
Caveat emptor.