The answer is, unfortunately, no.
There is certainly stuff to like in Blameless: Professor Lyall, Connall Maccon's second-in-command, gets more screen time than ever and remains the most enjoyable character in the series: a quietly effective, fastidious fellow. If Carriger wanted to write a romance about Lyall, I'd read it. Some of the other minor characters are also engaging -- I'm fond of Biffy and Lord Akeldama, too, although they hardly appear in this novel. Ivy Hisselpenny gets redeemed a bit from her bizarre status as clown in the second book. The story is reasonably engaging and hung together all right, though I could've done with fewer random fight scenes. Most of the book doesn't include Connall Maccon, and given how little affection or sympathy I have for him by this point, that's probably just as well: what I did see of him sunk my opinion of him still further.
I liked it better than the last book, but I think I'm done with the series. I'll give it a 7.