Sure. First, some generalizations/opinions about Christmas:
-Christmas is a Christian holiday, not a gift-exchange holiday. We don't exchange gifts on any other feast during the Church Year, Christmas is the anomaly in that sense.
-Santa Claus (at least in the modern sense) was invented by department stores to sell stuff
-Black Friday and the "Christmas season" are marketing strategies to make money
-Christianity isn't about making money, and often this money making is done in very unhealthy ways (causing stress over buying gifts, stress over going into debt or not having money for gifts, gifts that are simply wasteful and will sit in a drawer until eventually sitting unused in a landfill, less the fair trade to create and ship these unnecessary gifts, etc.)
-The false equation that is operative in gift-giving is often "I can't tell you how I feel about you, so here, let me buy you some junk so you'll think that I give 2 cents about you."
So Operation Christmas Child is based on many of these issues. Furthermore, it's very much the "band-aid" approach to make us feel good, as in "Oh boy, I feel so good about filling that shoebox with basic toiletries and cheap toys. I'm so glad that I've done my part. Should I ask the question about why those kids don't have access to toothpaste or toys? Nah, that's not really in the holiday spirit."
It reeks of colonialism - here, let us rich Americans tell you poor Asians/Africans/South Americans what a happy Christmas looks like. Now, you're just going to get this little shoebox and my kids are going to think the Christmas tree vomited wrapping paper when they see all of their gifts under the tree, but you should be happy just received .05% of what my kids do. There's also the paternalism in thinking that we are the givers and "they" are the needy receivers.
Instead, I'd much rather develop a relationship with a community/school/village and find out how they celebrate Christmas in their local custom and then take part in that. And with that relationship, to care for them and learn from them. But that takes work. It's not a pre-packaged program to feel good about, so we don't do it.
I know that people who support Operation Christmas Child would disagree and be offended by this, but that's why it's my unpopular opinion.