Logan has been a very unsettled baby from day one so I don't think I had the immediate bonding either. Have spent most of the first few mths just "caring" for him and trying to struggle through a haze of sleep deprivation and constant crying!
He is now smiling,laughing and interacting which really pulls at the heart strings. I do still find myself amazed that he is my SON and not just a child to be looked after.
From speaking with others, I don't think it is at all unusual to take quite some time to truly bond with your baby.