Not a Bitcoin expert in the least, but it is my understanding that it isn't possible to charge-back and therefore there is less fraud on that front. However, on the other front (being non-trackable), I would reckon that brings in even more fraud.
Fraud is everywhere these days. I've even recently seen people using stolen PayPal accounts, and I had always thought that PayPal was the end-all-be-all of ensuring clean transactions.