The ammount of people who will buy it not knowing they can't properly share their levels is going to cause a huge shitstorm.
There needs to be a warning on the front of the box.
Yeah, this particular title is likely to get a lot of attention, what with releasing close to Super Mario Run, and if its shortcomings aren't well communicated beforehand, I fear it may harm goodwill from the mainstream.
For all it's missing, the game does supposedly have 100 new courses made by Nintendo preinstalled, with their own set of medal objectives to give them more meat beyond just beating them for the first time. I heard a complaint among the casual folks is that SMM didn't include a more straightforward,.classic type of campaign mode (since the quality in the runs made out of fan-made levels could be very uneven). If they leverage these new courses, they could make the title's weak points easier to forgive.