This comes under the heading of 'could have', 'should have' been a decent movie. Instead, it is a catalog of wasted opportunities.
Specifics: leading man Gene Barry acts like he would have been happier beating up suspects rather than romancing a bevy of beautiful babes.
Speaking of babes, this was filmed during the 'swinging 60s' - so it wouldn't have hurt to have shown some of the great legs and/or cleavage. What was the point of casting the gorgeous girls if you were going to keep them covered up? There seems to have been a lack of energy among the movie-makers - caused by the heat of the location? When the hero pulls his car off the road (to avoid pursuers right behind him), there is a great cloud of dust which the bad guys would have seen - but didn't. A small detail - but indicative of the phone-it-in attitude of the production crew.