I can see how that MIGHT be, the tech of the original stormfire was so low, maybe modern sheilds aren't designed to counter it. I personally doubt this is the case.
Damage from the SF adds up quickly, it has a high rate of fire, you don't have to wait either for guns to cool down for very long, or for your capacitor to recharge.
Refire rate for Stormfire Mk. 2: 0.10 sec, meaning 10 shots/sec.
IIRC, the original stormfire does 4 damage, uses 5 energy, and has a refire delay around 0.05 sec, which would do slightly less than SF2, which does 210 compared to 200.
SF2 is better IMO, because it does more damage per hit, thus requiring less dwell time per target, and shorter bursts mean less maintenence per gun.
The rapid firing guns on today's fighters spew thousands of rounds a minute, but firning for more than a moment or two would use up a great deal of ammo, plus most guns begin to malfunction after so many rounds in such a short period of time-they overheat.
I like both versions of the SF, the are effective, and sound cool, although I think the Reaper cannon in WC Academy sounds the best. The first time I heard that, I nearly shot out of my chair.
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Don't look conspicuous-it draws fire.