In a way you're already doing this by running credit history and background checks. It's not exactly what you're looking for, but the information in your due diligence should tell you a lot about what type of tenant the prospect will be.
But let's step back and think about this from afar: You can have review sites for businesses because the business is intentionally placing itself into public discourse -- I don't think you can really say the same for tenants. The concept is interesting, but having a hidden landlord-only blacklist seems really shady. Imagine if you were on the other side of the table...
Also think about the credit bureaus, and how much of a hassle it is for people to correct errors on their credit reports. Even with three main agencies, there is still misinformation and confusion that can ruin a person's access to credit. How would tenants ensure that only truthful info is posted about them? Who would regulate/control this thing?