Quite a bit if I felt it was worth it.
None of it could counter what History has repeatedly proven.
You're right. Nothing that could be said on this forum could counter the historically proven fact that you can't please everybody every time...and, given my experience on toy forums over the years, toy collectors in particular.
Certainly there are things Mattel could improve, distribution probably main among them, but at the same time I think a whole lot of folks are pretty unrealistic in both what they expect and what they think Mattel 'owes' them.