I see it as simply "too complicated" for most people. It could maybe work, but can even a hunk of a man, not spread himself too thin among 2 women?
It's practical to insure a more fair 1-1 pairing of males and females, rather than the most popular men taking all the women, leaving nobody left for me to marry.
But since it was apparently, at least tolerated in the Bible, I don't judge against it so much, especially in countries where it's still their culture.
Also, I don't believe humans should use any means of "birth control," because the human body simply wasn't designed to hinder the natural flow of life. I can deal with all the babies 1 wife might have, but what about 4 wives? Another baby every few months? Maybe if I am rich, but otherwise, am I just a "stud," and the mothers work together to support their own children? Seems a bit too "complicated" to me, not to mention all the possible relationship "jealousy" factors.
So just 1 wife, ought to be enough for me. The other wives can still have all those babies, but with their own separate husbands/families to support them.