I think you people who think the Kathleen character was just a bad casting decision are missing the point entirely.
This isn't a story with typical tropes, like an evil "big bad", who selfishly acquires power for the sole purpose of being our antagonist. It's about normal, every day people who, due to circumstances outside of their control, find themselves doing things they wouldn't normally do to survive.
So for me, hearing a soft-spoken woman lead a group of people didn't make me think "what horrible casting". It made me think "damn, what the hell did she do to command the trust and respect of all those men?". We know very little about her story, what her relationship is with the people of the QZ, why Sam & Henry is so important to her, etc. Hell, she probably WAS something like a school teacher turned rebel leader for some reason, who knows? But I do trust all of that will be revealed in future episodes, and we'll find out what kind of fukked up shyt she did to earn the loyality of the people.
Anyone shytting on her character after half an episode and with so many unknowns are really acting in bad faith here. You have to at least give the writers the benefit of the doubt. If her story isn't believable at the end of the season, you can shyt on her then. But as of now, you sound stupid and shortsighted.