Comey is not my highest priority either. I think what he did to Clinton for a mix of reasons - political pressure from the NY office, a compulsive need to grandstand and be seen as 'apolitical', and personal resentment - is unforgivable and had immense consequences for the nation. I also think he admits to some of that in part of the excerpts I've read. And I think the man is still a patriot who believes Trump is a clear and present danger and wanted to do the right thing - even though he helped get us here. Most people are more than one thing. Comey is a classic and perhaps tragic case of that.
Will I ever buy his book? I don't know, probably not. But the excerpts are very compelling, and I feel I understand his very complicated and flawed mindset a little better.