I like her. A very fun ability. I'm thinking of normal Torpedoes. While the Flechettes are the cheaper option, I like the idea of 2 attacks at 4 dice outside my arc.
And let the silly overpowered complaints continue.
I don't think Nera is OP, even with regards to other missiles, because she doesn't actually fix any of the problems with missiles/torpedoes. She makes them somewhat more usable, but all the weaknesses are still there.
The obvious parallel is to Proton Rockets, which fix pretty much every weakness missiles have - high cost, timing for target locks, burning target locks causing inefficient attacks, etc.
It does make poor Rhymer seem even more like he got the short end of the panic stick on his ability, though. Rhymer pays about 4 points for an extra range band, Nera pays 1 for a turret.