Frankly, anything that isn't "slow the entire room by 95%" is a step in the right direction.
Seriously, how has Gloom lasted this long for that amount of slowdown?
I get a lot of people who tell me "Do you hate Wyrd Scythes too?" when I mention the ability.
I tell them "No, because it only affects a few targets of which you'll probably kill next anyway."
Funnily enough, this ability follows that same idea.
Orphanim Eyes slow was the least of our worries-- it's just situations like Gloom that are too widespread.