Is Cash flow per door a good indicator of a good deal?

[Bryan Tasumi]

Is Cash flow per door (after all expenses, mortgage, cap ex, etc.--i.e. everything) a good indicator of a good deal? Can you analyze whether a deal is good or bad based solely on cash flow per door? If so, what is the amount of cash flow per door you need? Will looking at cash flow per door always translate into a good cash on cash return, cap rate, IRR, etc?

Any examples of when cash flow per door (after all expenses, etc.) doesn't work? 

[Joe Villeneuve]

Originally posted by @Eric James:

How does $100/month positive cashflow for a $1M property sound?  Does $100/month cashflow on a $20K property sound better?  This is a simplified, exaggerated example, but I think shows why cashflow can't be the only thing you look at.

It is if you are looking for cash flow. Take it a step further though...CoC Return is a better gauge with a minimum cash flow.