really long queues (for everything!) and lots of screaming kids. unless you have children who absolutely love lego then avoid.
Personally I didn't think Legoland was all that. It's good for youngsters and those that like slower rides but as a thrill seeker who loves rollercoasters I found it a bit boring however my little brother loved it. There was only really one big rollercoaster and it wasn't very impressive compared to others. I think Legolands target audience is mainly youngsters as they all seemed to really enjoy it.