I really think it doesn't need a nerf simply because it was buffed for a full 2 months or more without many problems . . . until Auto Rifles got nerfed, that is. In mid-range engagements, the Thorn's TTK is great until a few bullets get thrown at the user. This makes the target hard to hit and Thorn's TTK becomes crap. Auto Rifles used to have a similar TTK as Thorn but typically won in closer engagements because the hail of bullets threw off the Thorn's aim too badly to be used well. Only skilled HC users could use a Thorn against an AR and only skilled users came out on top. TL;DR I think Thorn isn't the issue, having no ARs to balance the playing field is.