Palms buffet is very average IMO-not worth a trip,but if you are there and you are hungry than Ok.
Rio now has two of the "bad"buffets in LAS and they charge big $$$$ for the seafood buffet which features mostly(if not all)frozen fish and tasteless seafood.
I remember when the "real"Rio team opened the seafood village and the big to-do they made about the kitchen and storage facilities for the buffet.I think the only thing Harrahs is holding in those tanks and coolers is the coins and bills they suck from their customers pockets these days