Absolutely nothing wrong with Riviera Deck. We just sailed on Conquest in September (in room 1340) and had not a single complaint.
I do advise you to not stay in your room too much...not because you won't like it, but because the ship is gorgeous and has great ocean views, and a variety of activities.
Here's a tip I wish I had known...go to the fish and chips restaurant (Sur Mer, upstairs from the main Lido restaurant buffet area) early in the cruise because the food is good but as more people find out about it the line gets very long. We found that the food was not as good when the line was long...maybe the cooks were hurrying in order to handle the crowd. First day we went, we were probably 3rd or 4th in line and the food was great. On the last Sea Day, we were probably around 50th in line and the food was not cooked as well. Fried seafood not so good when breading is not fully cooked
Have a great cruise