I ahve been there many times, not on vacation but i assure you from what i have seen the children are very well catered for but not so many that they would ruin your vacation.
The poo as i am sure you have seen is designed in such away that you are not packed around it like sardines having to listen to the innevitable childrens squeals. The pool brances out in many directions and its quite easy to find yourself a nice quiet nook.
I have been to the shows in the evening and on the beach and again it is not overrun by kids. I think you will have a wonderful time as it really is one of the nicest hotels i have seen in the way of catering for everyone.
Dont forget to check out "The Circus of Dreams" show on the beach, I hear its very good.
