I have a friend who was a social worker and her opinion, though she was lambasted for it on MN is that children over the age of three are virtiually impossible to successfully adopt, the damage done in the first few months of life is too far reaching
As i said ealier though, the threaseholds for removal are higher than they once were and so it depends on what the issues were, usually even if a parent is failing the child has had some positive interactions with other family members and this lessens the 'damage'.
Often family mambers are not able to care for the child full time,though,so the ned for fostering and adoption. Whilst may leave them with emotional damage, they turn into killers or torturers.
They just won't have the same quality of relationships and interactions, with others, but may still do with their own children, with support.
A lot will never be truely happy, in the sense that others are and they have to work at having a 'successful' life, emotionally speaking.