I tried to touch on this long ago, but you said it better then I did at the time.
I firmly believe if they had made the attraction a Luigi’s Mansion adventure (as you suggested), or a Mario Adventure, the system, the AR, and the interactivity would have made it all a slam dunk.
The issue is the franchise concept chosen, with the ride system they are using.
And I think this is compounded in the online community by what happened with F&F.
And I don’t see this as an unworthy argument to make.
I know it will be fun, I can’t wait to ride it, but I don’t know if the right choices were made for this attraction.