The Filipino women want a man who will provide for them, and know that many of the local men work overseas so there is a shortage of educated men to marry. They tend to be protective and motherly to the men, and the men thrive on their love.
It's not just in the USA:
in Korea, about ten percent of the farmers marry Vietnamese or Filipina women because local women don't want to live on farms and have babies.
sometimes it doesn't work out, because the girl is a gold digger or the man is abusive, but that would be true of any marriage.
I have recently entered the Catholic dating scene and have located two seemingly compatible divorced or widowed Filipinas right off the bat — within 150 miles here in my rural area of U.S. — would like to marry both of them!