Using ternary logic causes a lot of things (like the custom cypto) to be non-standard and thus hard to evaluate. "Rolling your own crypto" is a red flag in itself, but making such choices while everyone else in the blockchain/DAG world mainly uses tried-and-tested building blocks, seems like a red flag.

And in the end they are "just" red flags (= warning signs), which might hint at fatal flaws, but also might not.