@GmMichael: It is deadly, and should be. And yes, your players should repair and upgrade their ship, otherwise they're begging to be offed in the cold of space
Also, remember that going above the hull trauma threshold doesn't destroy the ship, it doesn't explode (straight away). That honour is left only to starfighter minions, and perhaps rivals. For it to be totally destroyed you need the appropriate critical result.
@Krieger22: Yes, its increase or decrease, but only for targets with silhouettes 2 or more points larger or smaller than attacker. So Silhouette 1 PCs won't need to increase or decrease when shooting at silhouette 0 or 2. In this case, I think the boost or setback dice could work well as a substitute.
Edited by Jegergryte