I've finished it! Woo Hoo!
I actually thought there were quite a number of passages like the "cable-laying" one, where there were pages of detailed descriptions with no action, followed by a chapter in which the plot advances more in a few pages than in the last 100.
I like the "page-turning" kind of book, the ones that I can't put down because I really must find out what happens next. The fact that this sat in a pile on the edge of my bed for so long is evidence that it didn't do it for me. So I take onboard what you say about 'The Scar', but I won't be reading it very soon.
I don't have much more to add. Obviously some great ideas in the book - the Kephri insect creatures, the Cacti creatures, the Remades, the city of New Crobuzon itself, the crisis engine, the construct, the Weaver.
The suggestion that all of this was a result of some ancient weapons technology that went wrong in the distant past was interesting.
I read that after creating such a world, Mieville should have written more than a "bug-hunt", but that wasn't a problem for me.
I think they were rescued from impossible situations a few too many times by the Weaver for my liking.
Thanks for the answers Brys and j.d.
That's an interesting explanation about why Yagharek did what he did.
Only he still wasn't human, he could never be fully human, he could not break his beak or remove his clawed feet. So, I would have thought he would have taken up Jack Half-a-Prayer's offer. He had more in common with the Remades.