I've only seen two background things really handledwell so far.
Cleric class and Drow background. Everything else has felt lackluster
That's not actual Background stuff though, that's class and race. I don't think I've seen anything related to your background in this game yet. It also makes it weird when you can have an Outlander background but you're still from Baldur's Gate. Curious how they are actually going to incorporate (and they really should) your background into the dialogue/quests.