Going to have to second that.
I was on the Eurodam for Thanksgiving. The word was that there were 180 children onboard. Only about 25 showed up for the teen events. For my cruise, we happened to have a director who basically didn't do his job. He didn't lead any activities that were on the daily programs, and all he basically did was turn on the DVD player and complain about his job. Midway through the week, a new director came onboard who was much better that would be taking over for the old director after quit.
Did I have a good time on this cruise? For sure. This cruise was probably the best cruise I have been on. We made our OWN fun, and we always found something to do, anything from going to the gym or just hanging out in the Silk Den. We entertained ourselves by just walking around the ship with after getting a slice of pizza. We also enjoyed the basketball court that was towards the rear of the ship. The movie theater was also really nice to use, it was just hard to find a seat. The only thing the Eurodam didn't have compared to other ships was an arcade, but it really didn't bother us much.
Would I recommend the ship for teens? Yes, if your son can make friends on his own and not rely on the teen center to provide activities. The first night, the director didn't make any attempts to do ice breakers, he simply just put Posiedon in the DVD player. One of the outgoing teens started a basketball game, and slowly we all started to get to eachother through the game.
There is very limited information about the teen center on the Eurodam out on the internet at least before my cruise. If you have any other questions, I'd be more than happy to answer.