For me it is the the amount of scammers that are surrounded with bitcoin. It gives bitcoin a bad name and frightnes potential adopters/ companies to get started with bitcoin.
The way bitcoin works, leaves no dissatisfaction to me.
This is also happening when two parties has a medium of exchange of fiat currency. It is just the scammers using bitcoin as their medium for scamming because they can leave the transaction with a minimum risk of exploitation of identity.
