I liked it, I liked it a lot! It gave background, gave us a bit of empathy for him...but it didn't make him too soft! Often, IMO, a pitfall of revealing a character's backstory is taking the edge out of him by making him too sympathetic. I think you avoid that though.

You know, Thanos of Titan, in the old comics--I say old, because I don't know if they "updated" his origin--killed his mother as she was giving birth to him, because of how he fearsomely tore through the womb.

Pretty cool origin story! I'm interesting in hearing more about his uncle!