I agree, the lackluster pools/outdoor areas are a huge negative on
DCL for families with actives teens. My 13 and 15 year old boys find enough to do to keep them busy but nothing really fun/wow. The aqua dunk is their favorite, along with the free flowing ice cream! They also play shuffleboard and go to movies. The clubs are hit or miss for them. We make a point of planning fun/active things at the ports to make up for the low-key sea days.
We have been debating about our next few cruises. On DCL we really enjoy the shows, the dining, and
Castaway Cay, so we are back and forth. We are lucky enough to be planning cruises once a year for the next few years until the boys go to college, but I am going back and forth on staying with what we know vs. trying the Norwegian ships that look like they have so much more for my boys to do on sea days.
It would have been so easy for DCL to add an amazing deck with a few more waterslides, a zip line, a flow rider, a climbing wall. Heck a climbing wall and a zip line would be relatively inexpensive and easy to add to any of the ships, they hardly take up any space! And IMO the basketball court is a huge waste of space begging to be replaced with something with major Disney wow factor.
P.S. The Fantasy does have the Sports Simulator and minigolf which are fun, but my kids prefer the Aqua Dunk (body slide where you start almost vertical) on the Magic to the Aqua Duck (tube ride) on the Fantasy. I hope I have those names right. Also I am not sure what the Dream has.