Well, to the younger posters who haven't lived the married life yet...
What you have to keep in mind is even for someone who once knew the ins and outs of cooking, laundry, shopping, etc., when you're away from it for even a few years as a working stiff, things can get foggy. I've seen it several times over the years: work-a-holic dad, spends maybe two hours a night at home, brief time on the weekends, nannies and babysitters and/or mom raising the kids, keeping up the home. Then this fella lost his job and tried the Mr. Mom thing. His wife (a friend of my ex) would just constantly complain, he doesn't know the settings for the washer, puts in too much detergant, overloads the ingrediants for a simple dinner, etc.
When you're away from that world for too long, you get a little rusty, and it's a big-time adjustment not just getting it right, but also chasing kids, cleaning up after the dog, phone constantly ringing, etc.