I still do not understand how NXT was developed in such a short time. Brilliant people can be, but with a good amount of luck.
Exo, to be good,  should not present a code in a single class. Now yes, after a few months have a customer with a more decent Code. Luckily it was not hacked everything. A guy with the profile "Dr Evil" found a bug that could have ended the project.
I'm no expert in cryptography, but a project takes a good few months to get ready, tested, and always comes out with some bug.
If it is really serious, we should wait longer and only after, but many tests, put in production. So we would be actually building a new currency and a new ecosystem criptocurrency rather than something to just captalizar some money and turn a useless altcoin any.