The well cast ensemble actors portray a multi-generational family (who, as a quibble seem to be a tad too close in age for my comfort level: they ALL married right out of puberty??) that supports each other and (usually) respects each others' autonomy with a common thread of shared humane ethics and respect for the land that is so lost today in the too-smart urban TV series that are simply so artificial or self-conscious that I find them repellent.
If a Pollyanna moment threatens, the writers seem to be able to pull it back into a realistic scenario efficiently and so avoid the cloying (and disastrously anachronistically 'historical' When Calls the Heart) trap and viewer nausea. Congrats to all production crew as well.