Technically, this is competently written, and the narrators do a decent job with their parts once I sped up the playback to 1.25 times normal speed. But...
I was bored a lot of the time. It got interesting for awhile. I like Kaladan and Shallan, but they don't make up for the clunky world-building or the overall awkward tone of the writing. This reads like an opus to fanfic much of the time, and it's cringe-worthy fanfic at that.
And the whole lighteyes/darkeyes thing just feels weird. Like the author wanted to include something about racism, but didn't want to start up a sh*tstorm by doing it badly, so decided that eye color made a good alternative. Maybe he heard about Jane Elliot's blue eyes experiment and figured it was a good stand in. It's not though.
If this were only 200 or 300 pages, I might feel compelled to power through to the end, but there are another 800+ pages to this thing, so my patience has run dry.