Thank you for your feedback! There's a few things to keep in mind:
1. Take every bit of information with a grain of salt. What Maeve tells you, what Az'Lean says, what MC thinks they know to be fact - it's all biased in some way.
2. Narratively, there wouldn't be much incentive to side with the fae and abandon everything you've ever known if the humans weren't flawed. So there is a bit more focus on that at first. (Though I do think that the writing makes it clear that the humans can be quite ruthless and vindictive. So I'm not sure what you mean by it not being depicted as bad?)
3. The fae have done some bad stuff, to be sure, like the assassination of the Queen, or stealing newborns from their families. MCs father seems to be traumatised from the battles he was in, and knights don't usually grow old.
4. Humans, as far as they know, arrived on the continent at the same time as the fae. The fae say humans arrived later and started taking land. At this point, it's impossible to know which version is true. That's why MC reacted that way - they don't just take Maeve's word for it.
5. When you look at the map, the kingdom is in the middle of the continent, while the fae lands surround it. If the humans were colonizers, you'd think they'd have settlements on the shore and expand from there. The fact that they don't doesn't have to mean anything, but I'd say it's an indicator that the situation isn't quite as clear cut.
I hope that could give you some reassurance that the conflict will indeed turn out to be nunanced!