I rather liked the first two Twelve Kingdoms novelizations, although the writing is indeed a bit flat (my writeups here - as you know, I tend to be wordy). I was pleased to hear that vol. 3 is actually going to come out soon - I was afraid that the series had been dropped.
The other two I checked in your poll were things I might like to read myself ... .
I haven't seen the anime at all!
(A digression: I don't like to watch video stuff unless I have company. If I'm by myself, I prefer to read. So I've read a decent number of manga but have seen barely any anime, unless you want to count things that I watched as a small child many years ago, such as "Astro Boy.")
I had a long comment here about some aspects of the world in the story, but realized it was moderately spoiler-ish. I'm going to add it below the cut on my vol. 2 write-up, if you feel like talking about it.