I would add that it is part of a larger equation - and people are often quick to judge despite not knowing the rest of the parts of the sum.
E.g. How much does the child get outside of Christmas?
I've known rich families be so proud of giving only 4 presents for Christmas, compared to those "poor" families that give so much... And yet those same rich families are buying things for their kids weekly, every time they go to town, when ever the kid wants something, while the "poor" families, save up and wait until Christmas to do it all.
Also, how much is the kid giving? That is another huge part of the calculation. Of course they shouldn't be giving as much as they are receiving, but I'd rather have a child who receives a lot while giving their mum+dad+grandma a home-made present that they put a lot of care into, than a child that gets less, but gives nothing.
You could keep going, e.g. How materialistic is the child? How generally spoiled are they? How much do you do for Birthdays and other celebrations? How old is the child, are all of the presents plastic toys? or is there useful stuff mixed in? etc. etc.
So many factors come into the equation of whether a pile of presents is suitable, and most of them you won't know, when judging others.