Interesting thread, Have only skimmed over responses.

My answer is yes and no.In cases like you have described and a child is in danger, I do judge.I had a Friend who deliberately got pregnant at 18 to her heroine addicted boyfriend.I wont go into detail but the friends mother works for DOCS and now has permanent custody of the little girl.While I still try and be there for the friend because I know she is a good person underneath, I just cant understand her choices.I wish i didn't judge in these cases because I don't know the whole story and I really suspect mental illness in her case.
Apart from this, when I am talking about general parenting issues, schools, sleeping arrangement,food etc.I don't judge those different for me.Every parent ultimately loves there child and are doing the best thing for them.Just because co-sleeping works for me, I understand it doesn't for others etc.