I lean towards those who say kids brought up by single mothers have a problem. Chicks especially who have, from their childhood, never encountered a man's way of doing things find it quite hard to adopt. They grew up being pampered and have probably never known the word 'no' said with authority. Woe unto any dude who dates them...from experience, its a nightmare even to make decisions with them.
Dudes brought up by single mothers are spoilt and irresponsible. Many are known not to take responsibility (living with mom till 40) and may exhibit strong affinity for relationships where the woman is the provider. Initially, they may be very attractive to date for women coz they're basically very girly and will not exert control in a relationship. The downside comes when bread has to be put on the table or when hard decisions have to be made....the dudes will simply be quite slippery
In the end, I also believe that someones individual nature contributes significantly to their xter and therefore upbringing contributes only a fraction