All in all though, I thought the books were a tour de force of the imagination. But I still don't quite get what Mrs. Coulter is supposed to be about. Having so complex a character in the mix will certainly give critics something to chew over for decades to come. I wonder if Pullman himself was quite deliberate in the way he constructed her character, or whether - as so many writers tell us - she developed a life of her own?
More spoilers:
I gave this a bit of thought and I think that Pullman is suggesting that any human no matter how selfish and evil has a capacity for love, and then I found this quote which I think clinches it.
"I told him I was going to betray you, and betray Lyra, and he believed me because I was corrupt and full of wickedness. I wanted him to find no good in me and he didn't. There is none. But I love Lyra. Where did this love come from? I don't know; it came to me like a thief in the night, and now I love her so much my heart is bursting with it. All I could hope was that my crimes were so monstrous that the love was no bigger than a mustard seed in the shadow of them, and I wished I'd committed even greater ones to hide it more deeply still".
Now, obviously there's mirroring of religious ideas here but I think that's in line with how Pullman sees religion as a dark mirror to our humanity.