Just finished the final chapter now. Really enjoyed it, the duel between the Khan and Mortarion is one of my favourite duels between the Primarchs that I've read so far, in particular I love how Wraight described the Khans style and ability. Though in choosing Mortarion as an adversary for him, he managed to make the inevitable stalemate more believable in picking the fastest and slowest of the Primarchs. I feel he ended the conflict within the Legion well also, it could have very easily ended in a shit manner, but it didn't.
Overall Scars, was a brilliant novel, one of the best in the series I would say. My main praise being directed at how he gave the V Legion their own flavour and personality. He didn't just go 'Mongels in space', but he didn't completely do away with that comparison either. I really liked the idea of the Legion not really caring about the Crusade at all, or the others, but just wanting to hunt, to chase to the edges of the galaxy, unrestrained and unburdened. The Khan was also characterised brilliantly, not just blindly following Horus, or the Emperor initially until he had all the facts.
I do still find it odd that the Space Wolves were even involved at all. Whilst I did like their parts and always like more of Russ and the Vlka Fenryka, they could have easily been made into another novel, or their own novel. Seeing as it wasn't wrapped up really in the end, they were chased into the nebula and then made ready to leave it. Again, like the segments dedicated to Russ and Bjorn, but think they probably should have gone into another novel. No great shakes, just hope I don't have to wait too long to see how their situation resolves.
But yes, very good job Mr Wraight, very good job indeed.