I agree with you, he’s my second favorite (third?) Key writer. Besides Lucia’s route I’ve yet to read a character route as good as Komari’s. Also loved Shizuru’s route (2nd favorite from RW), and Kurugaya’s. Chihaya’s was pretty good as well (like better than a lot of VN routes I’ve read, but still under most of RW routes).
At least when it comes to Rewrite, I think Tanaka is overrated. Sure, Akane’s route was damn good, but Kotori’s was the worst character route from the game and Terra literally ruined a considerable amount of Rewrite’s quality.
I also would if it wasn’t a doujin with ugly art. Sigh. Why such a good writer writes so few VNs?