What the charts you provided don't indicate is whether they represent individuals who have name on deed.

I would not say that this short-term moment is necessarily indicative of the prospect of the overall market over a 5-10+ year horizon. 

CoC is more of a year 1 indicator and these aren't 1-year term investments.In future positions, someone scaling to 4-6 Class B+ or better properties over 10-12 years, and selling/re-fi'ing 1 to 2 out after 12-15 years is really the route.

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.

I'm also learning that yield is another important indicator of a property's profitability.

She improved the houses and now indicates that she wants to sell them off, as the idea was more promising than the investment. 

Many CPAs do not do not provide this service at their practice so that may give you an indication on what it takes to do it correctly. 

None of those would be 100% deal breakers for me.Credit score is an indicator of risk, but I like to look at the report details to see how they use credit. 

I have been looking at factors that affect where I would like to live (weather, politics, taxes, night life, etc.) but I am guessing that these don't necessarily indicate a good financial investment.

Analyze local market trends, rental demand, and economic indicators to pinpoint growth potential, and reach out to local investors / RE professionals in your area.