I, too, am sorry you didn't enjoy your cruise.
The Island Princess is our favorite Princess ship, as we enjoy the intimacy of the smaller size, rather than the Grand Class Ships. I use a scooter or wheelchair and I never had a problem finding a place to park for a show..........given, we plan for a 45 minute ahead arrival. The wheelchair seating is in the last row, so it is harder to see, but it is also easier to get out after the show.
Our first Princess cruise was disappointing when we compared it to our very first cruise, on another line, we had been on. We went back to Princess for the itineraries, and while not super cruisers, we have been on twelve Princess cruises and enjoyed them all............even the first one with the sticky Horizon Court floor! That ship was leaving, and has left, the Princess fleet. Personally, I don't think that the Princess theaters are any worse than any of the other cruise lines we have been on, at least for handicapped cruisers.
May your next cruise be the cruise of your dreams!