That's a bit of a shame - I've been enjoying the progression of playing with a single upgrade-able weapon. Honestly, having played with several, most of the artifacts aren't overpowered; by the time you get to the point of needing to upgrade them, there are often better weapons available.Artifacts will be removed in the following update, and instead relegated to endgame weapons, like Terror Bark, for this very reason.
It's just the Shard of Thanos; it's right click ability insanely out-damages basically anything else and the huge number of hits it delivers triggers things like the Sanguine Glyph multiple times per second. It's also a bit awkward - the way the orbitals form, they hit things to your right much more effectively than things to your left.
Maybe do something similar to the summoner or ranged artifacts, where its an ability on a cooldown? If right click gave you a spinning field of orbitals that lasted a few seconds but could only be triggered on a cooldown it would still be an excellent weapon while fixing the exploits. That's kinda how I thought the weapon would work when I read the description - I expected the right click to be an emergency short range shield, not the primary function of the weapon (I can't remember the last time I used its left click attack).