Hmm. I don't know about that. Reviews usually will reflect the overall quality of the game. It's not a secret that City Folk did not meet Nintendo's sales expectations - especially since the Wii had a very strong user base. But the game was received with less enthusiasm by the reviewers, and the Animal Crossing community than the 2 previous versions. Why ? It disappointed fans with subpar graphics, a shallow new feature (the city), and not much new to add to the Wild World plate which came out 2-3 years before.
It might not affect our decision (us, the crop of enthusiasts that are maniac enough to be posting on Reddit or specialized forums like The Bell Tree), but if New Horizons was wanting, and disappointing it might lead to lesser sales on the overall than expected. Don't forget we are a very small portion of the Animal Crossing fanbase, and a tiny fraction of the overall video game players pool. Those, less informed, and more mentally stable bunch might just pass over New Horizons if the game garners a bad reputation at launch.
I don't think people should be labeled as being mentally unstable because they don't share your enthusiasm.
People will either love it, hate it, or be indifferent to it.
It's just an opinion, it's not a medical condition.