What they fail to address is that there are so many more single women than single men in the WTS, that each year that ticks by from the age of 18 there are fewer and fewer single men, that while a 35 year old man can wed an 18 year old girl and little is said, that if a 35 year old woman marries an 18 year old man, a great deal is said...it's a scandal. Even an 85 year old man can wed a 22 year old woman at Bethel, only months after his first wife dies, and no one wonders why she did it...
That so many marriages where women marrying men and vice versa that have little knowledge of what it means to treat their spouses as people as Jesus treated the people in his life. That so many women are desperately looking for a husband, because in the WTS, women have no status as individuals, only as reflected through their husbands. Women are not called to Bethel unless wives of candidates or to marry Bethel men who are already there, with "heavy" jobs, or go to Gilead, or get the perks that elders get. I saw nerdy guys with trophy wives because of the status of Bethel and/or elders. (a few "exceptional" women get called to Bethel or Gilead that still revolve the status of some man, fiance or father).
I feel that happy marriages in any situation, jw or not, depends on how each spouse treats each other, with value and respect, supporting each other. I have seen happy marriages at the KH and outside the KH, and religion was not a factor unless that religion undermined valuing, respecting, and supporting each other.