I don't enjoy Banno's ambition or overall character because it reduced to, "Look at me, I am satan, I'm going to take over the world" I have trouble with Banno as a villain because there's like no depth to this guy being evil besides him being a really terrible person. I don't know man, can someone like actually explain his plan to me.
I'm also a little mixed when it comes to Banno. On one hand, I find it somewhat refreshing that our big bad this year is a hammy egocentric psychopath who adheres almost completely to the villains' rulebook with little effort to subvert any of the characteristics. He feels entitled to dominate the world purely on the strength of his intellectual merits and he will happily disregard everything he has built as well as any notions of family to get there. No real vicious personal vendetta gone terribly wrong, or any warped sense of altruistic mission. Distilled villainy.
On the other hand, I suppose it could have been done better. A deeper look into the working relationship between Krim and Banno would have been nice to flesh them out a little more substantially. Otherwise, Banno is a little
too hammy for my liking. Like a very exaggerated dial-up-to-11 everything you would ideally hate in a person. Unethical, sadistic mad scientist? Check. Zero regard for family and their wellbeing. Check. Even uses his own son as a pawn at one point. Check. Willing to flat out murder his son, because he's expendable and a nuisance to him. Check. Has just as little regard for his android creations and cackles maniacally when one of them dies in a very public display of human-like behaviour. Check. Literally sees everyone else in the world as data he can store and process? Yup.
It's like the Heart-Brain-Medic trio became too sympathetic to carry the rest of the series as villains following Freeze's hasty demise (or that they feel kids aren't very interested in complex villains), so Banno was conceived as he was to be as far on the end of the spectrum as possible to compensate.