I'm not familiar with US salaries I guess it greatly depends on the state/city you're in. But in the UK I don't think this amount is uncommon for some doctors or software developers, especially outside of London.
After tax it's probably closer to $2800, and health insurance is around $600/month for a pretty average plan. For a family of three this leaves you $1000 left over, and even the crappiest one bedrooms in California in small towns start around $1300/month.
Comparing different countries’ wages just isn’t a good comparison. Consider the typical health insurance premium and student loan burden for US workers and you’ll already see why a UK comparison would be apples and oranges.
