Did you notice the mirroring of the Middletons and the Palmers?

Sir John and Charlotte Palmer are both happy, willing to believe the best of everyone, and rather foolishly full of good nature. Mr. Palmer and Lady Middleton are more fashionable, less willing to please, and feel themselves above their spouse.

It seems that Lady Middleton has a happier marriage situation than Mr. Palmer. I wonder if that is because the wife is the chosen one, and the husband the chooser? Therefore, Mr. Palmer has done more to merit his own discontent? Or is it that Lady Middleton can (usually) redirect her husband's general geniality into more elegant channels, whereas Mr. Palmer can not affect his wife's public and obvious air-headed behavior?