I bought Parenthood on 50% sale just because it was cheap and I thought it would add a couple of nice things to my game. It's not my favourite pack but I think it's nice to have.
I like the character traits, though I agree that the positive ones are too easy to have, especially good manners and responsibility. The school projects are a fun activity for parents and kids or kids and their friends. Having siblings break them is also fun sometimes. I like it when kids make a mess and I like some of the sibling/kid/teen interactions that come with the pack, such as tease about crush, accuse of touching possessions, convince monsters are real and make funny faces. I don't use the parenting interactions much. I hardly ever make my parent sims force or influence their kid to do something or teach their kids to say something.