They're noir detective novels written from the perspective of a character with outdated views on women, the author's other writings (even the occasional short stories from the perspective of other characters in universe, many of which are from the perspective of said women) aren't written that way (with a few early-on exceptions). The female characters are actually really great, they're interesting and multi-faceted, it's just the first thing the narrator notices about them because he's a horndog.