In every one of Sanderson's books that I've read (and I've read most of them), I've seen characters who are believable. Elantris, Mistborn, Warbreaker - they all had people who were complex and fully developed. Few characters were "static" or "two-dimensional"; they would act in ways that were unexpected yet entirely in keeping with who they were, intellectually and emotionally.

Jordan's characters, on the other hand, have largely been ersatz humans with two-dimensional personalities and little emotional, intellectual or spiritual growth. When they display emotion, it is often with stock phrases and cliches.

One of the very few instances in the entire series that has had any real depth has been Rand's "soul-searching" on Dragonmount at the end of The Gathering Storm. I'm not sure how much of that scene was Jordan and how much was Sanderson, but I'm willing to bet that it was more of the latter than the former. I never saw anything that real or immediate in Jordan's writing.

As for the other points, it's obvious Jordan's "Old Tongue" is a pile of crap, linguistically speaking. He would have been better not trying to write "in" it if he can't be like Tolkien. But he so desperately wanted to be like Tolkien.