Every Darius I've ever seen on PBE and now live have all taken Electrocute
There are so many better choices between Phase Rush, Grasp, and hell even Lethal Tempo would be better to get the stacks off faster and more AS for your steroid.
To top it off, Darius doesn't even need/want most of the things in Domination.
No matter how well they do in lane they cannot even compare to other champion's rune synergies late game. So much wasted potential.