I have sailed on the Oasis of the Seas and I loved it so much that I have booked her sister shipe the Allure of the Seas.
I found the ship was very exciting and everything was well organized. Embarkation and dis-embarkation were very smooth. We never felt crowded at all. There is much to do onboard and when we got to the ports of call it did not feel any different than any other ship.
We had an easier time finding chairs by the pool than we have founf on smaller ships.
No, the ship is not too big.