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More traditional minifigures would be preferred for myself as well and most adult fans. But I think at some point we need to judge the theme for what it is and not what we would have preferred it to be. I don't see a value to having a smaller set with Mario in it, because you need some decent amount of "level" for him to interact with for it to be worthy anything. If Mario was available stand alone, he'd probably cost $25 to $30, and then you'd have to buy a $20+ set for him to interact with.
More generally, I think there is a tendency among LEGO fans to try to argue that a product they don't like won't sell well, for various reasons. Probably happens in other fandoms as well. But to me it is not really that productive of a discussion, because we consumers never have that much data on what sells well. And it tends to start from a place of justifying an opinion of the product. For myself, I am cautiously optimistic about LEGO Mario and will get at least a couple sets to try it out. If nothing else, it is introducing some interesting parts. I really like this Mario and I hope it stays with us many years to come with new suits and add ons.