The benefit of P2P marketplaces has been discussed for sometime now in the Bitcoin community, especially after the failings of MarketPlaces like the Silk Road. External marketplaces holding onto funds due to escrow run a high risk of being compromised security wise, and a P2P market place fixes this. Just a note.
"Fixes" - You mean doesn't provide escrow at all? The nature of escrow services is that a third party has to hold onto the funds and verify the transaction. If that has somehow been "fixed" then why even bother with making a shit coin, just launch a P2P market for Bitcoin and collect your millions.