Stephen Diehl is the most eloquent skeptic I've found (stephendiehl.com/blog.html). Much of the complaints point to unregistered securities fleecing retail (absolutely happening) or just overall complaints that humans are irrational (man yells at clouds). In light of his arguments, I still side on the perspective that this is genuinely new technology capable of giving the entire globe digital property rights. It's going to be a rocky road.