In regards to attractions and fun, this place is l...

In regards to attractions and fun, this place is loosing it's battle with other local theme/fun parks. As an example comparing it to the Energylandia from Poland I would give it only 5points against Energylandia's 8. Don't expect awesome, top notch attractions.
What is so special about Legoland then? Everywhere existing Lego bricks and many Lego built monuments plus making almost all the attractions somehow connected to Lego characters - your children will love that ;)!
In my opinion best for children from age ~7 and older if they are not affraid of height and moderable speed. I recommend buying platinum Q-bot for the second day, once you know what you like to try out more and play with.