First off, my husband and I are in our early 40's. We went without the kids. This is our 11th cruise, but our first with RCCL. Its always funny how people on the same sailing have different experiences. Personally I loved Oasis. I have minor nit picks, but no complaints. This ship is truly spectacular.
Embarkation was a breeze, in fact, it was the easiest and most well organized of all of my sailings. I did not pre-book any shows, so once onboard I was directed to Studio B. I chose all of my shows and times and got everything I asked for at the times I wanted. It took about 20 minutes. Easy!
The Royal Promenade is beautiful. It doesn't seem like a cruise ship, more like an upscale mall. Here is my minor nit pick. No portholes. Unless you are up on deck you do not realize that you are at sea.
No drawers and far from the fun stuff. Stay AFT. Too far from elevators but we were in a quiet hall. But it was like a maze finding it, too many twists and turns.