I think this overstates things with the archer a bit (she's only really "bad with words" when she's smack in the middle of a really awkward conversation), but it's not meaningfully off the mark. She's a relatively weak presence when she's not responding to Ranta's sexual harassment.
Outside of the most utilitarian conversations, any interaction with the women in the party inevitably revolves around men's attraction to them. Where the post-adventure montages give a pretty good idea of what all the guys in the party are interested in or want to achieve, for the women they only build some sort of quasi-romance between the mage and the priest. Haruhito has had a heart to heart with everyone but the mage, but his one-on-one conversation with the archer was about how she wouldn't have minded so much if he peeped on her because he's a nice guy and would apologize or something.
Grossness aside, it's a huge drag on the character development in a show that has put a lot of directorial time and energy into gradually building its characters. That's what makes it so disappointing. With the writing the way it is, it's tough to care about anyone.