I genuinely have to give the people that made this game some sincere credit, even before having played it but with the knowledge of what it is and the reactions so far. When this first leaked I couldn't begin to think what was going through the head of the person that came up with it. Peach Rabbid? #Selfie? Instant dismissal based on a dislike of the characters involved.
They took something that really had no reason to be a good game, and made something unique (within the context of Mario at least) and unexpected with it. The art style is gorgeous and befitting of a Mario title and by all accounts the gameplay and depth to match, and even surpass, others of the franchise.
It's become an instant purchase for many serious gamers despite having had all the appearance of an extremely casual or childish game. Not to knock casual gaming, I just think it's blown expectations out of the water from people that would otherwise have thought it to be shallow.
To take something that disliked and make what they have from it is impressive. It also makes me wonder what they could do if they had other, less controversial, IPs to work with.