I think Damian had potential beyond the finale he received with the Heretic story, but I can understand why a lot of readers really think it is a fitting end to the character. For me, it isn’t fulfilling. I actually [i]enjoy[/i] the character when he is written [i]correctly[/i] and has a good group of characters around him to [i]challenge[/i] his point of view and organically come to terms that he isn’t as great as he thinks he is. Say what you want about how messy the current run of animated films are, but for what I can see the film writers have a better idea of how Damian can and should develop then the people who write for him in Teen Titans. 

There’s glimpses of him fulfilling the “defrosting ice queen king” trope as he gets more comfortable and starts to change. The problem with the comics in handling that is they decide that whatever moral or ethical dilemma that Damian has learned from isn’t important enough to be a lesson Damian remembers or has affected him; he’s just there to be “edgy Robin with a katana who is perfect” forgetting the whole point that he [i]isn’t[/i] perfect and that’s one of the reasons he’s being humanized in the first place.

But it is what it is, I guess.