I have never been very close to my extended family, and every time I hear about nuclear families, I don't see a problem with it. While back when the concept was mainstream, it involved women not going to work, but with women in the workforce just about as much as men are, the idea of going to work, and coming home to a nice home-cooked meal by my wife sounds quite nice if you ask me.
I've had bad experiences with extended family. Some of them are rude and puritan as f--k. They'll say nasty and mean-spirited things about tomboys and autistic people, belittling them. That's why sometimes I think nuclear families are more accepting of others than extended families, though not all extended families are bad.
Vote yes for nuclear
No for extended