1) I doubt that you pay as much. I pay less than half of that and have a comfortable salary. Did you include the "Arbeitgeberanteil" (which is not part of what you are paying)?
2) You can't easily extrapolate that number to a whole family. Kids are usually insured for free if the higher-earning parent is not privately insured.
No, this is on par with what my friends in Germany pay for their family. The difference is Germans have nearly no deductible and there is little worry about in-network vs out-of-network treatments.
For eg: if you work for a Swiss or US employer and make more than 69k(?), say 100k, as a freelancer, and have a family, you have to pay around 14%(upper limit somewhere around 1000) of the income as health insurance contribution.
I think it is costly. It is difficult to digest for me that the health insurance costs more than housing.