I like what you're saying about Twelfth. But what about Nine?
I don't have an opinion on the ninth Doctor comics. I've dutifully collected them, but I haven't read them, as Nine (and that era) isn't a particular favorite of mine. I started to read the first mini-series, then it went on hiatus for months, and I never picked it up again to read it. I always thought I'd get around to it, and I didn't. The mini-series and the ongoing series are sitting, unloved, in my longboxes. I did read his chapter of The Lost Dimension, though, and that was fine.
Also, it goes without question that Cornell redeems himself from the abhorent Four Doctors, which is thankful.
"Abhorent" is a rather strong word.

I liked Four Doctors a lot, right up until issue #5, when I thought it went completely off the rails. Oh, I get what Cornell was doing -- he ended the story with a giant Moffat pastiche (rapid-fire storytelling, timey-wimey nonsense, unearned feel-good ending) -- and he did it in such a way that he pushed a giant reset button on the entire story (so issues #1-4 were rendered pointless), and then had everyone forget about it at the end for good measure. And what Cornell did had implications for other stories, too -- if Cornell's interpretation of what happens in multi-Doctor events is correct, then does Eleven remember "The Day of the Doctor," does Five remember "The Five Doctors"? Coming on the heels of Tenth Doctor Year One and Eleventh Doctor Year One, both of which told interesting, meaninful stories, it was disappointing that Four Doctors, which started off important, made itself meaningless at the end.