the interdictor's missle jamming ability does work, and it only REDUCES the accuracy of the missles, it doesnt short them out or whatever. I just played a mod allowing me to use and build the interdictor, it was in my main fleet. I found the missle jaming to be VERY helpful, especially since in this mod the rebels make around 7 Y-wing squadrons (they have like 15 fighter squads total in their fleet) My fleet of 5 venators, (That deploy V-wings yay) 2 Imperial Star Destroyers, 3 Acclimator class destroyers, and of course, my prized interdictor. (it looks so pretty) I conquored the entire galaxy with my fleet. Trust me, in the mod im playing, its hard to win over even ONE planet