Either this has been nerfed or is bugged or is not what I expected.
It has been a big disappointment so far. I tested this out by kiting efreetis in Jewel. Looks like you have to be pretty close to get this spell to land. I tested by rooting the mob getting close and casting - a significant amount of time I only got the message "casting Arc of Arrows" and nothing landed, when it did land damage was less than expected.
One thing though it does not appear to break root.
I will send feedback in case this spell isn't working as expected.
If this is working as expected, I would much rather have a better nuke than this.