I disagree with your assessment that Venli's stance is one-dimensional. Even early on in her first two chapters I was really impressed by the nuance being shown. Venli is right, the humans and Fused DO both suck. She has little reason to trust any of them! But when her followers point out her plan to fuck off from the war and reform the listeners has some issues, I was immediately impressed she admitted to herself that they were right even if outwardly she didn't know what to do about it. It's less egotism because she is consciously checking it and is aware if her past mistakes, but she is torn because of the very real need for self-preservation while having to rebuild a separatist group and her entire culture from scratch. She is pretty different tonally from everyone else at this point of the story and I can see how that could be grating but I loved it.
It is completely one dimensional. It's not taking any sort of profound "actually humans do bad things in this world" kind of stance, it's just Venli's typical "i know what's best and refuse to reconsider my positions" attitude. It's exactly what she was always like with her scientific pursuits unlocking new forms and pushing the Parshendi along. If she'd slowed down even a second to listen to Eshonai or anyone else's concerns, she might not have literally killed her entire race, including her sister. That's the entire tragic point of her character. After all, she doesn't "just happen" to be the Last Listener because she happened to survive by chance. That's Rlain. She actively created the destruction that happened, and now has to move on with the burden of what she's done. But here she is - still pigheaded in her own egotistical ideas. She admitted to herself her followers were right that she has no plan? Of course they were right - Venli has no idea what she's doing. But STILL she presents this "I know whats best and you have to listen to me and trust what I tell you is right" front to her followers, without deigning to listen to what they have to say. In fact, she even disdains her Singer followers for adopting human traditions like marrying eachother. She's failed to progress AT ALL from the extremely damning character flaws that led her down her previous path. I don't think she has grown. I do not respect her intelligence. I do not root for her to succeed. I think she SHOULD fail in her goals. The only thing she has going for her is that she's undermining her clearly evil bosses in the Fused and Odium, and is on the side of a clearly sympathetic people, which are the regular singers trying to find their place in the world, while being in the opposite faction from all our other "good guys". I think that's a phenomenal place to put an interesting point of view character. But her goal isn't to help them the best way she can. It's just to create the ideal singer lifestyle that *she* envisions, regardless of what they actually want.
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG