Aww I like The Shocker. He's one of those guys who's just interested in getting the job done, grabbing the cash and get out of there, but keeps getting distracted by heroes mid-robbery. Which might frustrate him/piss him off. He's not that big of a villain but he deserves some credit I think. He's been at this for a while and he's not actually stupid.
It really makes me laugh how in his flash back speech he openly calls himself a two-bit loser. Out of nowhere. Ok, that's kind of expositionary and not something you'd expect when someones cracking a safe.
He really seemed to have gone through a personality change when he got to prison. Shocker does not strike me as whiny. Perhaps this is cus of the empowerment of his new weapons, not just having them, but also the sense of having created them. Let's be honest that requires some innovation and skills.