The biggest and main flaw of this game is the microtransactions. (metacritic.com)
This is the result of two main flaws in the market: the difficulty of identifying who will be a good teacher and the reliance on an obsolete conception of the pool of potential teachers. (educationnext.org)
I had really, really, really hoped this one would fix HW main flaw, aka lack of online co-op, but alas that did not happen. (nintendolife.com)