I'll try to keep this as short and sweet as possible, and thus will not go into every single reason I don't think this show holds up. The show has a good 1-3 episodes in the beginning before it falls apart. It suffers from "I did not explain anything during the show's launching season and thus nothing makes sense without a second season" syndrome. You are left with far more questions unanswered than answered by the end of S1, despite it positioning itself as though it has wrapped everything in a nice, tidy bow at the end of the last episode. You should reasonably be able to watch any show with a villain and know exactly what their motivations are by the end of the first season. You should be able to know what the actual motivations of your protagonists are before the end of a season as well. With HC, you don't get either answered with certainty. You could argue that it draws you to an additional season, however there are several moments in the show that break the moment and make it difficult to get immersed once more. It moves with a fast pace (which some shows can do well without losing the impact), however you end up losing far more than you gain as a viewer because of it. Moments that should have more time, more emotion, more suspense do not get the luxury. We instead get drawn out scenes that, in the end, do not make a difference to the season as a whole. HC is like a poorly-stitched patchwork quilt; the episodes that the creators chose to make do not fit together nicely nor do they make sense on their own.

Spoiler, click to view

There is no reason why we needed the backstory of Aya more than the backstory of Vijay or Leo. There is no reason why the motivation of the king to collect the cards should be weaker than that of the mafia. There is no reason why Finn is able to shoot as far as he did in the final episode, considering he has the aim of a Stormtrooper the rest of the show. There is no reason that the police are not informed as to what HC is considering it seems to operate with the PD similarly to the way the FBI would with PD in real life.

I will give the show that the voice acting is pretty okay. However, the animation is absurd in moments that it needs to not be. Example:

Spoiler, click to view

When Lindsay tells Finn he doesn't want to see him again. Why exactly does Finn look like the surprised Pikachu meme? Why is Finn completely emotionless after hearing this?

The characters as shown to us in S1 were as bland as saltines without salt. It was painful to watch. I do not recommend watching this show past the 3rd episode and I, more than likely, will not be watching S2 (least not expecting to like it should I actually do so).

TL;DR: The show breaks the moment for the viewer on multiple occasions. It gave a support character a background episode instead of a "main" character, it is woefully predicable regarding its twists because it's hard to immerse yourself again once the story pulls you out of focus, and the story as it sits at the end of S1 does NOT fit together cohesively.