I'm not sure why people think Miers would in particular be subject to this weakness in her mental acumen. She's been in Washington for quite a long time. I'd be more worried about an "originalist" who is finally freed from the burden of trying to work to get on a higher court.
There are simply too many troubling signs.
Not just refusing to join the Federalist Society-when offered, no less-but actually recoiling from working in concert with other Bush administration officials who had roots in that organization.
Nothing about this individual-regardless of the assets she may bring to the job-indicates that she is a maverick in any sense of the word.