I've seen several episodes, maybe 5 or so. From what I see, I like the Duggars. I think it's great that a secular station shows the lives of a family of Christians who can be a good witness to the world. They do seem to be very skilled parents. I think Mr. Duggar was doing well in real estate before the TV show. He ran for office on he state and national level, and through losing a congressional or senate race, got some press that led to the show.
I don't think every Christian couple is obligated to make as many babies as they can. Three is multiplying. I do think these folks are right to see children as a blessing from the Lord as opposed to some kind of negative burden. But if they want to churn out as many babies as they can and raise them in the knowledge and fear of the Lord to help influence the world, with the Gospel, good for them. IMO, they are the most influential people in the whole patriarchy/quiverfull type movement and they seem to be doing a responsible job with it.
If the kids want to marry off at 19, I'm perfectly fine with that. If I had a child at the right age to marry one of their kids, I might be pleased about them intermarrying with that family. Individuals may vary, but from what I've seen of the show (which is edited, etc.) it sure seems like they've raised their kids with good values. The girls are probably a lot more ready to be mothers at 19 than your average college grad is at 29, IMO.
They do make the kids work to help out with the little kids, bake bread, cook, clean, etc. I think that is a good thing. A lot of Americans think kids are supposed to 'enjoy their childhood' and that is fine to an extent, but kids who were made to work, be disciplined, and have responsibility, instead of playing video games all the time or just doing sports after school probably end up with a better work ethic that actually helps them in life. I'm talking about chimney sweeps working 80 hour weeks or kids with rikets in the coal mine. There needs to be a good balance, and a lot of families err on the side of entertainment and fun for the kids Fun is good, but raising kids should be about preparing them for the rest of their lives, not just about having fun in the moment.