Saw it last night, it was another really really, really good film from Pixar. Shouldn't have expected anything less, when their lesser films are as good as Cars or A Bug's Life, it shows how good they are.
I'd agree that it's probably for slightly older kiRAB, there are some funny moments but overall less laughs and more story. And again, some great animation, the atmosphere in some of the night time Paris scenes is really well done.
While Toy Story is rightly highly regarded, I personally think Pixar's masterpiece was Finding Nemo, it's right up there with the very best Disney have done.