Personally, I wish that the Artifact research screen was really brought back into play. Ie; you Explore a planet, find an artifact, but have no clue what it is. Thus, you 'research' it -- low cost, but time consuming (relative to other technologies). Only once you've finished researching it do you find out what it does, and gain the affects of it. Essentially learning how to turn it on and integrating it with your race's technology.
As is.. just kinda seems.. lacking, like its tacked on. Not sure why it feels like that; probably because there's no input required other than the investment into exploring planets.
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I miss the research as well. Perhaps you could gain a small bonus just for finding it and increase that bonus twice to its maximum through research. And if you don't think artifacts can be game changing you haven't found the +12% damage one yet

. That plus the 50% antimatter used in phase jumps makes your fleets far superior.