Deeply good people who are imperfect enough to never seem saccharine, they have major disagreements and relationship-changing conflicts but value each other and their marriage enough to work them out.
Beginning in the series' third (and final) season, changes were made to alter the series back to a warm and slightly saccharine tone as seen in the first season.
Now the things we dared not say in the old days, especially when we observed the saccharine reverence of unworthy institutions, has gone the other way.