Start by asking where the points went, not how many there are. The total hides the structure: Nadi and Bhakoot alone carry 15 of the 36 points, so a pair of charts that fails those two can post a dismal number while agreeing almost everywhere else. And a 20 with both intact is usually read as stronger than a 26 without them. The result above breaks this down koota by koota.
Next, check the cancellations. Nadi and Bhakoot dosha both come with classical exceptions: the same rashi with different nakshatras, sign lords that are friends, and others. Mangal Dosha has its own list. A dosha that is cancelled is treated by the tradition as though it never applied, which regularly rescues a score that looked fatal at first glance.
Where a problem does stand, the tradition prescribes remedies rather than refusal: pujas such as the Kumbh Vivah for Mangal Dosha, charitable acts, gemstones, or timing the wedding to a favourable muhurta. We sell none of these, so read that list as a description of the practice rather than a recommendation. An astrologer of your own tradition is the right person to weigh them.
And families do proceed on low scores, more often than the score tables suggest. Astrologers routinely set the guna count aside when the rest of both charts looks strong: the marriage house, Venus, the dashas each partner is running. A low number is a reason to get a fuller reading done, nothing more.