It will then be up to the public to vote based on the stories told. This is better than an opaque system like PayPal which would centrally decide on who they think is right. It will be fairer, more accurate, less centralised.
Any vote based system is not a correct system for dispute resolution.Public opinion can be very biased and sometimes easily swings with some events.
You need fact based evaluation system but I guess by mediating in deals you will easily become party to the law suits.