Rocket Barrage, like her other abilities, is a tool, and it doesn't necessarily need to kill to be useful
Barrage can scare off would-be aggressors, or it can provide suppressive fire to a fleeing teammate
In some places, it is a great follow-up option to spectral wall for pelting trapped enemies
With the right build, Barrage can have decent kill potential
But above all, you should view it as another tool for peeling and stalling
Don't forget: you can slide, jump, dash, zipline, ropeclimb, wallbounce, and even more during Rocket Barrage!