I have to question the sanity of a woman who is willing to put her body through that many pregnancies(more than 5 or 6). After doing it twice....and being fortunate to have one of each sex...no way in hell was I going to do it again!
That being said....if a married couple wants to have a whole bunch of children....can provide for them...house, feed, clothe, educate.., love them equally, nuture them....then more power to them.
It's a personal choice, and provided the above is being done....I don't think anyone has the right to criticize those that opt for huge families.
I think in the case of the Duggers....there is probably some sort of envy/jealousy involved. Not many people can have 19-20? kids and provide for them exceptionally well, and all of them turn out to be a pretty decent family. There are many out there, who can't do it for just one or two...