It's a direct quote from Batman during Damian's introductory arc;
'Tim, I know the kid's very tough to be around. He was raised by international terrorists in his grandfather's League of Assassins. Brutalized, indoctrinated, then used as a weapon in his mother's insane war with me.'
There's a very important difference between Jason and Damian. Jason, for a short time at least, was able to be a child and had two parents who loved him and, in their own way, did their best for him (this was explicitly stated). He may have been a disadvantaged child, but at least he was allowed a childhood (even if it was cut short).
Damian, as far as we know, was never permitted such a childhood. He never had the security of knowing that he was loved by his parents. He knew Talia and Bruce more as symbols than as parents who loved him (he said Talia wasn't around very much when he was growing up). He was always treated as a weapon or a tool, the people around him cared more about his potential (either as a host for Ra's Al Ghul's soul or as the future Batman) than they did for him as an individual. He was a kid who was never treated as the child he was, and he was raised without love. I believe that is just as tragic as someone like Jason having that love, that family, cruelly ripped away from him.
I do think Talia loves Damian, and in his own way he loves her, but I don't think he is fully aware of it. He seems to think he was, is, and will always be alone. I find it hard to blame him for that, given what little we do know about his childhood. He doesn't know how to act as part of the 'Batfamily' because he's never really had a family, and I think that is incredibly sad.