Yup, the protocol isn't battle tested. Some stress tests have been performed, but that's nothing compared to actual real-world use. As in any experimental technology there are several premises that are assumed, hopefully, with good reason, and if any of these fail it might be fatal. For raiblocks, it might be vulnerable to certain types of sophisticated attacks (check the paper for more info), and more info must be gathered. Also, the cryptocurrency isn't anonymous, packets are sent unencrypted via UDP.