We were on the Dream last July. DS was 16 at the time and he didn't say anything about the dining room decor. The food on the other hand - he had lots to say, when his mouth wasn't full. He loved it. Trying new foods, being able to order without anybody telling him "isn't that enough?" Then with more freedon on the ship, he probably snuck off for many other things to try. At least from his noting how good such and such was, and did you know you could get . . . at this place, or at this time they put out food over by the . . .
How the heck he doesn't look like a ship is beyond me. And, at 6' 189 pounds, he wants to add a few so that he can be better on the football line. Oh to be young again.
Teenage boy - very visceral. Mostly mouth and stomach, and raging hormones. Keep their attention on the food, there are bikinis on board. Many other distractions than the decor. Good Luck. And enjoy. I'm already dreading next year when we send ours off to college.