This is the 6th time I've cruised, 3rd time with RCL, and my first time on one of these mega ships. Hurricane Irma resulted in changes to the itinerary and extended our 7 day cruise into a 10 day cruise. I thought RCL did a reasonable job of accommodating the cruisers by offering a 50% discount to internet, drinks, and specialty restaurants.
I believe the largest disappointment for my family was the lack of entertainment and things to after dinner. In the past, we enjoyed having dinner, catching a show, listen to some music, and hit the comedy clubs. On the Allure, if you didn't have a reservation to the headline show, there was nothing to do aside from hitting up the casino, drink, or shop. On second though, maybe thats exactly what they want. For 6k passengers, their comedy club fits about 200-300 people.
Windjammer Buffet: Honestly, probably the best choice given the number of choices
Smaller then expected with a half view of the Aqua Theather