Just returned from Riu Jalisco and will break down the pros and cons.
Pros: Tons of available chairs on the beach and by the pool, never had trouble getting any! Food is delicious and the service was great. I definitely recommend going to the steak house. We went on our last night and wish we would have gone sooner so that we could have kept coming back!!
Evening entertainment was awesome with something for everyone (white party, riding a mechanical bull, karaoke). The sports bar was open 24/7 but we rarely spent any time there.
The ocean was beautiful and there were no rocks to watch out for. Waves weren't overly big, but just enough for you to be able to boogie board. My group chose to pay and ride the banana boat; WHAT AN EXPERIENCE! We were able to see dolphins up close in the Bay.
Cons: No umbrellas on the beach, only the shade of the palm trees. Locals were walking around with umbrellas you could rent, but we didn't bother to spend the money.
Rooms are decent but the WALLS ARE SO THIN! you can hear EVERYTHING in the hall and out in the courtyard. I was surprised to see that no one else has written about that. Maybe i am just a light sleeper? Pack ear plugs.
Vendors coming up to you on the beach was also something that annoyed us. It took a few 'no's' for them to stop coming up to us.
Other than that, we had a great stay. Met some awesome new friends from around the world. Would definitely return!