I started reading Red Harvest about two weeks ago, but I'm only about a third in. Not sure if I am forgetting something, but I think it is the first proper noir detective novel I have read.
Overall, I am enjoying it - the plot is moving fast, the characters are all delightfully shady, but there's one thing that I am finding quite hard to get used to: I have never encountered a first person narrator who tells you as little about himself as this guy! You never know what he thinks, how he evaluates certain situations or people - or rather: the clues to all that are very few and far between. This definitely benefits the suspense, but I am finding it difficult to deal with nevertheless.
The book I read before Red Harvest was Edith Wharton's The House of Mirth, which, despite not being a first person narrative, was nothing but a dissection of the inner lives of its characters. Those two books certainly require vastly different ways of reading them!