Any ship with a trifecta will be strong. Two gats and a mortar on a mobula is a lot more dangerous, or three hades on a mobula. Nothings really changed with the Artemis. Sure its annoying, and it disables, but it takes forever to whittle the hull down. There are a lot of weaknesses to the build. The only reason people are now noticing, or now complaining, is because not everyone and their mother are taking gat/mortar. This all happened as soon as the game was balanced to create viable threats at close, mid and long range. Any nerfs to the artemis will put us right back to cookie cutter meta gat/mortar.
The issue is really with the players. They've gotten so used to charging straight at ships with impunity for a close range brawl. You've got to get out of that mind set and adapt. There is plenty of competitive material from the last few weeks showing triple arti junkers being used, and many times of them being wrecked. Every time they were wrecked, it was due to smart teams doing smart things. And likewise, the artemis is working really well with the Gents because we stay immobile, we go high, and we use open lanes to shoot. We could change guns, and change tactics anytime and still succeed. It's about knowing what to do with your build, the issue isn't the gun itself.
With any ship, any build, look at it's weaknesses. An artemis can't shoot up, and it needs time to target areas. If it's just hitting the balloon or hull it's really doing nothing. You need to use terrain, or different elevations. Go high, take a mobula. Stay out of 1330 meters, take a lumberjack. Go fast with a squid, take a carronade. There are proven easy ways of defeating this build, and it's up to each player to make his wins happen. Lamenting over the fact that you can't just shrug off artemises as you charge in a straight line at them isn't going to help.