I feel that Mozart did as good a job with recitative secco (continuo only, no orchestra) as anyone. No one expected those passages to be great music, most of the harmonic progressions were highly conventional (though Mozart could be predictably inventive in that respect), and the composer was doing his job if he kept things moving and enabled the singers to get the words out while they acted realistically onstage. Listening at home, I get impatient with it; in the theater, less so, but I prefer either through-composed dialogue or spoken dialogue - both of which can also be found in Mozart's operas, by the way. Just not often enough.
Once, when I was probably twelve or thirteen, I was watching a performance of
Figaro on TV, and my father, who liked opera only when it consisted of tuneful arias sung by Caruso or Roberta Peters, irascibly yelled out "Where the hell are the arias in this opera? All I hear is jabbering!" I replied, meekly, "There will be some. You have to be patient." "Well I don't have that much patience!"
He could be rough on Wagner too ("What's that woman screaming about?" "It all sounds like funeral music!"). T'was a hard upbringing for a young operaphile.