Too much makeup I think can look kind of bad but I let people do what they want. Though to the latter remark, they haven't proven to have skin-harming chemicals (it wouldn't be approved for sale otherwise) not is it proven to cause spots. It can cause premature aging (according to some studies) and acne if you don't properly cleanse your skin.
Ultimately, if they like that much makeup, all the power to them. I don't like it personally but I don't police people's appearances.
I wore full face makeup for one day, and I broke out, despite cleaning my skin thoroughly (and I almost never get pimples, thank God). Therefore that was enough for me. No point. No one even noticed a difference anyway.