We received credit for two free buffets with our stay at Aria. We decided to use the credits for lunch on a day when we were in a rush and needed food quickly.
I'm not big on buffets, so I don't have a lot go on in terms of comparison.... I didn't find anything particularly outstanding or of which I would have gone up for seconds. The mac and cheese was bland, the pico de gallo was flavourless, the pizza was ok, tacos were ok as well.
The dessert bar was fairly impressive however, with really nice squares, mini cupcakes, macaroons and a wide selection of ice creams with great toppings.
Because it was free, The Buffet was worth it, but I would have been pretty disappointed if I'd paid with my own money after reading all of the self-hype about being the best buffet in Vegas!