Although it's a good idea but it will take a lot of work, as others have already suggested you would have a hard time deciding who to trust, if someone accuses someone else of scamming, you need to have a way of getting to the bottom of the truth and prove before tagging them as scammers. If you have resources and you can do this, go ahead but make sure you have proofs before putting up names.
Thanks for sugestion. I will try to implement a voting system and every user or address added will have 0 rating.
So you could add your own user/address and get trusted or not.
Unfortunately I only have 1-2 hours free/day. Will ask some help here if anyone has html skills, for a simple website design. I have a simple website template...will post pictures soon