I mentioned in another thread that I read Rivers of London. I felt it was a quite good, rather than a great, book, and the twist as to who the culprit at the end was quite a novel one. Unfortunately, I felt that Aaronovitch's pinnacle, as far as I read, was with his novelisation of his own Doctor Who story, Remembrance of the Daleks.
I have read four of his books, actually. Besides the aforementioned novelisation and Rivers of London, I have read his Doctor Who New Adventures, Transit and The Also People.