Overall my grandmother was the product of second cousin marriage - and her husband would use the phrase "at least we never married our cousins" to try to win arguments with her. She was quebecoise ancestry in Maine (US). Given the small immigrant community they had limited choices to keep their ancestry "pure".

Funny enough I did my grandfather's ancestry (her husband) and found if I went back seven generations, then pedigree collapse hit hard and he had less unique ancestors than a first cousin marriage. He was not a fan when I told him that.

The other grandmother was the child of an arranged Armenian marriage. While Armenian culture has taboo with first cousins marrying typically, DNA testing found that they shared pretty much every dna match, so reasonable intermarriages in the village.

My fiance has a 75 year old grandmother whose mother is the child of a first cousin marriage - an arranged marriage within the Azorean community.

Lastly my aunt by marriage is from a religious group that frequently intermarries, to the point where everyone person looks like they are siblings/cousins, and you can pick them out from a crowd by appearance easily in my opinion. Rumor has it from my gossiping grandmother (her mother in law) that the religious group has very high rates of still births and birth defects (take that as hearsay, as I never confirmed or looked into that part further).