We really disliked it (I seem to be in the minority here). It's so loud. The whole restaurant (adults included) singing the Hokey Pokey whilst I'm trying to eat my dinner does not appeal to my dry British sense of humour. It's just crazy in there. Food was ok though. We are just a family who like to sit, relax and enjoy out food I guess...without waiters chucking straws at us.
(Yes I know this is the point of the restaurant, and I did know in advance, I just thought I'd give it a go for my kids sake, but she hated it more than I did!)