I, too, had one of those "immediate default" notes and it fueled my misanthropic inclination. I decided to explore those a little further, and identified many common characteristics, but the aggregate of those characteristics were not revealing (as you might expect). There is, as Skeptical said, no metric for morality!
I guess another reason I haven't given up completely is that most loans do not default (but a significant number do). For example, of completed B&C loans, approx 16% defaulted, or about 1 in 6. This is not my area of expertise by any means, but that seems really high if that includes a significant number of average joes and jills. My goal is, can I identify with confidence those that will not default? If I can do that then maybe I can move on to choosing loans with higher interest rates. Of late, I am gunshy and leaning towards A's from the ones my code is identifying.
This has been another example of my jumping in the pool before learning to swim. Fortunately it was on the shallow end. But it has also been a good excuse to indulge my coding hobby, and I've learned a lot about reading credit reports which will help me, I think, with my newest hobby, a rental property.
Thanks. Skeptical, for sharing your opinion and experience.