Iron Angel is an easy book to rate - it's good enough for one reading, but lacking enough not to merit much more.
This is a good example of British fantasy. It has a decently unique setting and cultural system, with lighter writing than you'd find in most American epic fantasy. The reading was mostly easy, plotting passable(it drags in some spots, though), and a few decent characters and exciting scenes top things off. Unfortunately, that's about all the food there is to say...
Cons: The main characters are the weakest characters in the book. The climax is also the weakest portion of the book, with several descriptive 'spectacles' that lack any special juice. Character interactions, though good between Thorn, Briar and Racky, are very weak between Thorn and Jewel. In short, Iron Angel has the emotional and character width of its own dust jacket.
Despite the flaws, I did enjoy reading Iron Angel. It's good, though, that I approached it with no expectations, because it's no extraordinary read.