I generally stay away from buying any death rays from battlestations unless they are Celestial. Regular laser turrets have comparable damage with a faster recharge time and range to the other death rays. As far as a nerf, I feel like they should just be ultra rare.
In the same vein, the nuke could stand a few more hp. It seems like even with several missile turrets running interference for the nuke, the nuke still seems to get destroyed before hitting the target much of the time. Perhaps just a slight tweak to the armor of the missile itself.
