I had a one night stay at the Rio after a 3 day stay on the strip. I would give 3.5 if I could as I was pleasantly surprised with our short stay. The room was very large, clean, and comfortable. All of the dealers and service people were exceptionally nice. The pool was pretty big and a good atmosphere.
I could see this the perfect Vegas resort for families (the pool was kid friendly) or those just looking for a get away. While I prefer the on-strip resorts that are a little more "trendy" this was a great off-strip option and should not be overlooked. Oh also, its not that far away - a $8 or $10 cab will get you to Caesers and a short walk will get you to The Palms.More