Well... i don't mind if they don't get down on themselves then pretend they are better than everyone else because of make-up lol (met too many girls like this it kills my soul lol), if they are sensible with it though and are smart enough to know that make-up or what others think of their appearace doesn't define them then i think they are cool (it's sadly rare for girls to think this though).
Up to them if they want to wear it, its not my face. Some girls at my school overdo sometimes but that's up to them. Others just wear it to give them like a confidence boost if they need it and some may wear it because they are insecure. Girls at my school wear it all the time and some of them cake it on there face, I think a little goes a long way. And a lot of them that wear it look better without it. There's no need to put all that stuff on your face.