Okay, it's in French, but since I can understand the language I can read that he is quite positive about the book. The most beautiful compliment (translated) for me:
"You have the same dream as Muis (=maincharacter) when he wants his grandmother to make him a Batman suit. You feel the same fear when Muis is hunted by a dog at a car-graveyard. You laugh together with Muis when he discovers his granddad's miracle-product to get muscles is a joke".
For those who like to read the complete review in French, click here.