The girls are quite right, in yourself you are generally more relaxed and easy going, you've been there before and tend to stress less about the little things that the first time round you tend to freak out about.

That said DD1 was a beautiful child, slept well, very placid and content.
DD2 is clingy, is not a fan of other people but with myself or DD1 she has the most beautiful nature.

Each child is different, i know people who have 2 or more angelic children, never had an issue, i know others who's 2nd child could be the spawn of the devil ... theres nothing set in stone, i think the old wives tale refers more to how you feel the 2nd time round, not how the child acts.