I think Droopy Master Detective has good points and bad points. Let me take bad points. Story was good. But the script arrangement wasn't successful. The pace of the script was slow. This may have been the major reason why the show wasn't successful. I think the script should have given to someone like Glenn Leopold or Bill Matheny.
As for the good points, the Animation was great. Voice Acting was great too. So it was watchable. Its great to hear voice of Don Messick playing Droopy. I thought Screwball Squirrel was ok.
Even a weak Hanna Barbera show is better than many of the cartoon shows released today.