I read from a service from a business called OB1 who "
verifies" OpenBazaar moderators. However, even totally trusted people can be fooled by good scammers. Thus, in reality what would be needed would be some kind of insurance for the escrowers, but this is currently (probably) unrealistic.
We're faring alright here at Bitcointalk without people having to verify their escrow each time they win an auction, mainly because the escrows here can be trusted. So it's not like having a trustworthy transaction with one layer escrow is not practical.
Having a service that moderates escrows won't be very helpful because these Level 2 verifiers may themselves be untrustworthy which pauses you to bring Level 3 verifiers to check them, and so on. Then it becomes a bureaucracy just to use escrow.
A trust and flag system like the one we have here would be very useful for decentralized auction sites, instead of a rating system, because it would let them detail the trade they made, how much risk they took, how soon it was delivered, etc. Then decision power shifts to those users who the community trusts the most, and those on their trust lists.
Trolling trust feedback can be for the most part stifled by not having a discussion forum for the auction site for trolls to interact on.