He has a "summer blockbuster action movie" writing vibe. Doesn't work so well for the exposition sometimes, but great when you dedicate an entire book to the Last Battle. I know he was given the ending that Jordan had envisioned, so I'm happy with what he did, and he stayed as true to the series as he could. Whether he was the best person for the job, I have no idea, but Memory of Light felt like a huge action movie to me and had my heart pumping a few times, which is very rare for a novel to do.
He won me over, personally. I'm going to check out his Mistborn series next, I believe. I've heard great things.