I've read the entirety of CJ Cherryh's Foreigner series. (See attached screenshot for random proof, bc it's a 15 book series at the moment - ignore the recommended books at the bottom bc I share an Amazon/Kindle account with my mother due to ease of troubleshooting. Lady really likes her romance novels and targeted-to-ladies books.)
Some thoughts on Cherryh's writing (keep in mind that I read them all sequentially in a short period of time, so certain things jumped out):
1) This series began as very, very fresh and extraordinary look at how different alien groups get along in the context of diplomatic relations between species combining with technological disparities and an extinction level threat to humans on that alien planet. It shifted over time to an ever-growing band of characters solving political problems in one species' ruling class as they come up with sporadic action sequences. I didn't mind the shift that much, but it does feel like Cherryh fell in love with the characters and decided to tighten focus drastically after the mid-series expansion in scope. We get told in almost side-bar moments that crucial events happen elsewhere, but they're ignored because... authorial intent has us worrying about little things around Bren.
2) I think Cherryh is a wonderful writer with two big flaws in this particular body of work. Firstly, she recaps way too much when writing as Bren and a bit much when writing as Cajieri. She is either doing this as a reminder to herself or she doesn't trust the reader to know what came before - despite this being a 15 book sequence with a 16th, 17th and 18th apparently on the horizon. It gets damn annoying. Secondly, there's no real sense of danger to any of the important characters. Since the first book in 1994, we've had essentially zero on-screen subtractions from the cast, despite some very serious threats and what are supposed to be action sequences. The cast keeps on growing and everybody has their own flavor and role, but there's no real danger to anyone Bren likes because Cherryh won't get ruthless. Plot armor for the good guys, yaaay!
3) It's still worth reading because this series is something different. Sorta like a Downton Abbey in alien-verse and with more action sequences. Cherryh pulls it off with enough style that I mostly ignored how her atevi societal logic sorta falls off after a certain point. The above two criticims were emphasized by me power-bombing through the entire series in a month and change.
4) I think the book covers in total are kinda... problematic in a racism sense. Yes, Bren is a blond human among very tall black skinned aliens, but every cover has him in all white clothing when he's explicitly mentioned as rarely wearing that type of outfit and it looks like he's always leading them, when he's in fact subordinate to a couple of the aliens. That's probably not Cherryh's call, but these are covers that genuinely make me suspicious.
I survived the Permian and all I got was this t-shirt.