Eh, it's a bit more complicated than that, as many things are. Many writers DID hate the marriage. Many writers were strongly in sport of it. It was always divisive, and it was certainly rushed, but it DID work and, more importantly, it built and grew and really worked and resonated with many readers. Some of the best Spider-man stories at that time involved their marriage, and I'd definitely argue that branching off of it to give us a real Spider-man family with the MC2 Spider-Girl series was, really, the essence of Spider-man at his best.
And I grew up as a kid and adolescent reading these married Peter stories, so every time a future editor said that kids couldn't relate to a married hero or that it made him boring, it confused the hell out of me. I wasn't "too old" for these type of stories - I was the ideal age bracket they wanted to appeal to and I found a lot of warmth and love and value in those stories.
And now, as a husband and father myself, I find these stories hold even greater value. Not just Spider-man, but any hero who views love and family not as "the end" or a hindrance to adventure, but a motivation to be even better and more adventurous than before.
I had a hard time finding good examples of family at home. Comics were often my escape, and there's a good reason so many of my favorite heroes were people who embraced the hardships but rewards of having a family.
Any writer or editor who says marriage or kids is a creative dead-end is a writer with no passion or imagination at all.
Hell, one of my favorite comics in YEARS is all about the challenges, drama, and triumphs of family.
Wrapping back to how DC is handling things, this is why I'm all for writers being free to write more stories with happily married heroes, generational adventures with their kids, and the freedom to explore the infinite number of challenges that marriage and family bring to the table.