The trick with Artemis is how many you can bring to bear. There are definitely better weapons to outright kill. The Artemis shines because its reliable (its so easy to hit you can expect to get close to max dps, dpc, dpb etc..) and because it's easy to get into arc. And once you get three or four of them on a target, the enemy ship is so disabled you have all the time you need to kill them. That's why hades/double Artemis is such a scary combination.