On unarmored targets its very good, but against armor it sucks, damage is lower than P90.
G11 is an assault rifle, not a submachinegun, it has assault rifle AP cost/size/weight, it should have rifle animation.
Replace the accurate perk by penetrate, or make it craftable, because that weapon is useless.
G11e is better, but still weaker than a good P90, and ammo is too rare.