I think the major gripe people might have with the anime is that it's not exactly what you'd call straightforward. A lot of things about the world are kept intentionally hidden from the viewer, and there's always this feeling that you're one step behind with knowing what's going on. This holds true for the majority of episodes, and the issue stems from binging the series like I and probably everyone else did. As there was originally one week's wait between each episode, I couldn't shake the feeling that the creators intentionally left certain things shrouded in ambiguity in order for the viewers themselves to reflect over the new information acquired between episodes. That's also strengthened by the fact that there's a recap at the beginning of each one. It's not until the final few episodes are over with that things fall into place, but even then it's still not the instant gratification that modern anime would emphasise. This style in itself is not bad, but is definitely something for a viewer to be wary of.
Characters were decent with some outliers. In regards to the protagonists, the brothers hone their contrasting powers and learn more about their place in this world, though that's about it for their character development. But frankly speaking, that's already more than enough. Seeing Naoya being able to use his powers towards the end of the series without the same fear compared to earlier episodes was nice, as he was previously more or less unable to even touch anyone but Naoto. In particular I enjoyed the character of Shouko. It's rather hard to go over why without treading into spoiler territory, but her role in the story turned out to be completely different from what I originally expected when she was introduced. Possessing the tremendous power she did led me to believe that she'd use it for a certain cause, but what actually took place was very well done as it both demonstrates a particular plot point and heightens the stakes for what might become a reality. Some may say that potential is lost, but this anime is not about each individual character as it is about the world itself.
I haven't seen the original TV drama so I cannot give any comparisons in that regard. Overall however, I liked this anime, in particular its tempo, music, and artstyle. It had some flaws, but this is still a solid 7/10 for me.
