So most of the new weapons I've gotten have been... well, really pretty nice.
And then there's the Shock Repeater. Which, uh, basically doesn't work? It's a PD weapon that, due to low range, low DPS, and low per-hit damage, doesn't actually manage to kill incoming missiles. Or do much to fighters. Or, well, do much of anything except waste your flux, really. I mean, it's kindof okay-ish as an EMP source against unshielded targets? But so are ion cannons, and ion cannons are longer range, lower OP cost, vastly lower flux cost, and can apply EMP through shields. (Edit: No they can not. Not sure why I thought they could.)
So, yeah. Does anyone have a use for these things?
The only other underperforming-ish weapon is the Disintegrator, and that's an AI issue rather than anything wrong with the gun: the AI doesn't count in its special hit proc against armor, and thus in flux-limited firing situations (i.e. basically all the time), it'll turn off the disintegrators even if it really needs them to chew through heavy armor.
On paper, a combo of kinetic weapon + disintegrator + cryoblaster is amazingly potent. In actuality it's only potent for the player, because the AI will just turn the disintegrator(s) off and never fire them at high-flux or overloaded targets.