https://www1.icsi.berkeley.edu/~nweaver/papers/cryptorisks.pdf
This guy at Berkeley directs some harsh criticism at cryptocurrencies, but he doesn't seem to have dug very deep. It's mostly about Bitcoin and Ethereum, with no mention of more innovative blockchains like BitShares, STEEM, PeerTracks/MUSE and EOS. His criticism is also limited to the status quo. Many inventions had flawed beginnings.