We ate at three buffets in vegas on our last trip...Harrahs, Rio, and the paris. By far the best one for me was the paris. The lines were long and there was some food that was above my head ( I had no idea what the hell it was). However, it was extremely good. I think I was happy with the buffet because I really love this resort. Dancing girls, great atmosphere, cold drinks, good music playing...this buffet may have an unfair advantage but it was really good.
The only complaint I have would be the extremely long line to get in.