It has been ages since I had access to a ship with an Ion gun. Never read the rules online so did not know what they did. So before I finally got my ship, I was surprised that they didn't ignore shields or ignore a persons turn.
For me, I always thought Ion guns or at least the Ion Cannon from Hoth when the Rebel fleet was escaping, it bypassed or ignored the Imperial Destroyers shields, or make the Destroyers not be able to fire back, which led the ships to escape.
I guess I am mistaken, but I wonder what other people thought when they first found out there will be an Ion gun.