Oasis reminded me alot of the Liberty of the seas. The double wide big sister did give us new places to visit like central park and the promenade mall. The captain said she had the most people on board ever at 8400 pass and crew but it rarely felt crowded.
The elevators at key times and wind jammer were crowded but for the most part there's lot of space. The reservation system was good, never waited in line for a show, (make your bookings online before you sail)
We took advantage of room service most morning for breakfast no the balcony (no extra charge)
The boardwalk cabin was the last cabin aft. the beds were next to the balcony. Space was average as was storage. The safe was small. The view of the ocean was good. Aft and starboard - almost like having an aft cabin. You had a 75 degree view of the ocean.
The balcony door required significant effort to open, perhaps by design?.
When the aqua theatre was running you might as well leave, as it was so loud. A couple of the shows went to midnight. Other than that the cabin was quiet. Good sea breeze and good size balcony with a rounded railing (slightly D shaped)