Here's a good link to start with for those really interested...
http://en.wikipedia.org/wiki/Duggar_family
From there you can surf out to other other reference sites to form your own opinion if you are not already familiar with this family.
Based upon your views, you will either think they are a by-the-bible far right-wing family that is perfectly normal or you will think they are the result of some fanatical parents that see each additional child as a means of extending their 15 minutes of fame while living off of the donations of others.
Personally I see them as being somewhere in the middle. I believe that
they believe that what they are doing is the right thing but 18 kids is a bit extreme (even if they were Amish

) and they do seem to enjoy the spotlight. Likely my opinion would be more favorable if they tried to live they life they preach without being so reliant, and so ready to accept, "donations" that likely add up to quite a tidy sum. At this point it seems to be a unintentional self-serving cycle... the more kids they have the more donations they get which allows them to maintain a lifestyle that allows them to have more kids.