3.5/4
Nadege is really tasty and whenever I'm at Yorkdale, I like to treat myself to something from there...but it is very expensive. I mean you can't really get macarons for cheap anywhere, so it might as well be Nadege.
My favourite "value" item from here is the raspberry pistachio pastry - good quantity-taste-price ratio.
Oh also, pass on the ice cream. It is creamy, but you have to pay a lot for the toppings. When I got it, my cone also fell apart on me as it was very thin. At around $10, there's much better things out there.