Eh, Walkers run was void of true characterization. He had cool moments and he made cyborg cool inspector gadget. But outside of that he was just some generic character. None of Cyborg's personality was in that book.
I agree with this. Cyborg lacked unique villains when he had a solo. They over played one angle of the character and missed the other half with it. Funny enough Walker did a lot of the tech villains too.That's why even Grid, who could have been his perfect nemesis, the Machine who wants to feel and will go to any length to feel something, anything, hasn't been used quite well since his introduction. He's a one trick pony and not that different from the rest of Cyborg's foes, if all he fights is tech or mechanical enemies. Batman doesn't fight just gangsters or Clown Princes of Crime, he has a very wide and varied rogue gallery. Each and every side-character in Cyborg runs seems to be either "human repeating that he is totally human" or "tech based vilain doing tech based things".
That's not great for the character, and his mostly monstrous body right now doesn't help him move beyond that, like every successful hero moved from his/her roots to become something more.