Questionable. Unconvincing. Poorly acted, though as a "documentary" it shouldn't really be acted at all. Nev's presence seems malicious and vindictive; not love struck and investigatory. After viewing, you may find you'll question Catfish's authenticity as a true documentary, when so much seems twisted, ingenuine, and conveniently timed.
2 stars for raising awareness to a modern and ever present phenomena. That's about all the positive praise I'll give it.