The Thin Man is solid noir fiction, and I quite enjoyed it, although the women are mostly burbling, sometimes hysterical liars (Nora Charles is a welcome exception.)
On the other hand, Dashiell Hammett doesn't seem to quite have the same turn of phrase as Raymond Chandler, so I think The Thin Man will probably remain in my memory less than The Big Sleep, which I read earlier in the year.
But it's solid, interesting, and definitely noir.