The Rescue Course was REALLY hard. Even after doing numerous techinical courses since I still remember that was mentally and physically challenging.
I never did DM but my experience of those people I've dived amongst is that those who took time to get a variety of locations, experienced difficulties and overcame them, didn't rush through to "get the ticket" were the people who were most competent and people I would trust to dive with. It's not the number of dives it's the extent of the experience and calm cool head that matter.