I don't think he is super great at dialog, either, but I like how his cursing is world-specific rather than just reusing what we think of as cursing in our world. He has quite a bit of it in Stormlight Archives (see: https://www.17thshard.com/forum/topic/7204-swearing-in-rosha...) but it doesn't "offend" us here in our world because it is specific to their world.