Our DD went on her first cruise at 15 and has been back at 16 and 17. She has loved it! She enjoys the entire cruise experience and made friends on each cruise. September was her first time with the Stack, but the kids used to have dance parties at the ESPN sky box a lot, so it was kind of the same. We found that many of the teenagers sinced up to the same schedule; sleep until their parents make them get up so they can have the room cleaned, showered, sun bathed, showered, joined their families for the show and dinner and then off to the teen club until the wee hours.
This past September my middle son was now old enough, 14 to join the teen club. He loved the stack, liked the counselors and found some buddies and had a great time.
My kids also enjoy family time and spend a good bit of time by choice with us. I think it all depends on your child, their personalit and what they expect. If any parent expects that the clubs will entertain their kids and keep their interest every minute, that just doesn't happen. With our younger son, 8 we pick and choose with him what activities he wants to participate in. Our older kids do the same on their own. .
They were recently given the choice of going to Disney World next February with their favorite Aunt, Uncle and cousins or go on another cruise, they picked the cruise hands down!