You can ask (if it's not obvious) what the nature of the disability is and what task(s) the dog has been trained to perform.

Although I’ve been investing in real estate, both directly and indirectly for 45+ years, I still get a “queasy” feeling when an investment does not perform as expected.My “aha” moment occurs when we reach the point when, despite the investment problems, we’re able to still show a good/substantial profit at the end of our holding period.  

The bottom line is that past performance is no indication of future returns.

You will have to gather more accurate operating costs (vacancy loss, taxes, utilities, insurance, mgmt fees, maintenance, HOA) to best determine potential future performance.

Every bank at that time had way too many non-performing assets on its books.

What type of loans are you buying, performing, non performing, seller financed?

Other ways of using SDIRAs could be to invest in syndications, performing  or non-performing debt, precious metals, raw land, precious metals, mobile home parks, self-storage facilities and more. 

Create a bonus structure that gets those managers pumped to perform.

Alternatively if they all love the deal, that's also likely a good sign.You can get a dog of a property in a crap neighborhood that will yield a 13.6% gross cap (not saying yours is), but that certainly doesn't tell the whole financial picture of how the asset will perform.

You could just invest in a fund that should out performed what you are doing.