OK, it's a cartoon, just like the Simpsons and Despicable Me and Spongebob, of course it doesn't have the immersion of a 3D world like Potter, it's not meant to.
The interactivity will be meet and greets, this is not a surprise.
Not everything is an E Ticket. If you always expect E Tickets (even from stores based on cartoons) you will always be disappointed.