This is a great movie for style and atmosphere, and a subtly told story...
....which unfolds into something a lot bigger than you were expecting.
It hits that 50s atmosphere on the head very well. Those cops were all so crisply dressed it was a great pleasure to watch. You can't predict what's going to happen.
Ignore the low-ratings it has been given by tasteless little dweebs who hated it cause it didn't have constant tommy-gun shooting in it, or whatever they wanted/expected... I guess the plot was too intelligent for them.