A tenant complaining online might indicate that the property manager handled them appropriately, so be sure to ask the manager for their side of the story.7.

A higher ratio (typically above 1.0) indicates that the property generates sufficient income to cover the debt, making it a lower-risk investment for lenders.3.

As indicated in either 3 or 4 years of looking at these properties only 2 properties of interest to us were auctioned.  

That is key, the consistency, and showing that for what you can get will be the indicator if they work or not.

Bankruptcy due to poor money management is indicative of a behavioral issue that does not change over time.

That indicates it's mounted loosely, or maybe at a bad angle.

I agree with @Nicholas L. that the 50% rule is likely to be the more accurate indicator.   

In addition, the capital outlay starts long before any income and the detracting of something from the primary structure even if it is just yard space.As indicated, my original protege made a lot of money (over $500k) on a land transaction associated with a large count ADU development.  

When other responders quote and agree with what someone said, that is a good indicator that the forum agrees.

Another lady said he'll be done in 10 minutes and asked us to wait.  20 minutes later, we interrupted them to let them know we had to leave and to ask if we can reschedule, he gave us a bad attitude, just said he was there at 5pm at our scheduled time, indicating it was our fault that we missed our slot.