I think it's just luck but it's because they added all those useless traits that matter to no one. I did get 2 weapons with fighter dmg 6% which was nice but I had used like 20K frags.
Even I must say that things are changed during last update, I managed to get a 11% fighter damage.
There are many different others, but I thing it is just bad luck,
I think they are constantly tweaking the artifacts, either for balancing or revenue generation. I haven't seen a good equipment artifact in months, and I am crafting constantly.