Disclaimer: Since I live in LV, I don't stay very often in LV hotels. However, sometimes I will get a comp room or friends will visit from out of town, which gives me an opportunity to assess the hotel and room quality of the place they are staying at. Personally, I think it is somewhat difficult to write a review of most LV hotels due to the shear number of hotels, what people are looking for in a hotel in LV, the age of the guest(s) and the price of the room. Example: If you get a room for $20 at Imperial Palace you really have nothing to complain about. However, if you pay $125 for that same room on a busy weekend, then most likely you are getting ripped off. So, anyway, use my review as just one piece of your puzzle when trying to figure out where to stay in LV. I call things as I see them based on my perceptions and biases, so keep that in mind.
I wrote the following review and attempted to post it on Trip Advisor. The review was denied by Trip Advisor without explanation. I contacted Trip Advisor why the review was rejected, but they never responded. I don't think my review of the Rio was overly critical or harsh -- especially reading some of the nightmare stories people have posted on Trip Advisor about this hotel.
The Rio is owned by Harrah's. It is their "mid roller" hotel of their properties in LV. It is an upgrade from the Flamingo, but not a Caesar's Palace. FYI: Harrah's is currently trying to sell the property.
The suites are very nice. My room was very clean, spacious, and well maintained. The suites have lots of space to spread out, a large bathroom, large closets, and small refrigerator. The room was about 2/3's of they way up and a had nice view facing north -- could see part of the LV Strip and Downtown.
Overall, this a nice hotel for a stay in LV. Everything you need is contained in this hotel and at night the hotel has quite a party atmosphere. The pools are very nice and well maintained. I would recommend this hotel to any traveller going to LV. There are a few things to be informed about if you decide to stay at the Rio:
Location: The Rio is not on the LV Strip. It is completely by itself about a 1/4 mile from the Strip. Next door is the Gold Coast -- low roller, locals hotel. Up the street is the Palms. Walking from the Rio to either the Strip or the Palms is somewhat impractical. So you either need a car or have to take a taxi.
Gaming: Since this hotel (for now) is part of Harrah's, it has the usual sucker rip off table games like 6/5 blackjack etc. Table minimums can be very high at peak times also. Though not as tight as it's LV Strip properties, Harrah's Rio is not very customer friendly in terms of machines and payouts. If you want better value on table games and machines, a quick walk next door to the Gold Coast can take care of that.
Bottom line: If you are looking for a self-contained hotel, with nice rooms and with a great party atmosphere, Rio is great selection.