We are Diamond Members of RCI. We cruise quite often. When we do cruise, I book several rooms. I must say I was disappointed with the Oasis of the Seas. The food was just "ok" and you needed to reserve any show you wanted to see on the ship or you wouldn't get in. About the only thing you were sure to get into was the Jazz bar (only a handfull of people attending) or the "On Air" bar for karaoke.
CAUTION! I would never book an interior room for 4 people again. The 3rd and 4th people have to sleep on this small pull out couch thats just big enough for MAYBE 2 kids. With the couch pulled out, you better hope noone needs to use the bathroom during the night as that could prove to be a chore trying to walk around everything to get there.
It is my opinion after crusing on several ships, I would stay with the smaller class ship. At least you will be able to see the shows you want when you want. I think our next cruise will be on another line to be honest.
Our balcony cabin was OK. The inside cabin I had for 4 other family members was awful.