I’ve been playing different builds exclusively to make this talent work for a while now, and I can confirm its usefulness is atrocious. I haven’t seen anyone use it except me btw.
This talent needs to be either buffed or reworked. The easy route is to keep the 5 sec invisibility even when you attack enemies. This way it’s gonna be a good talent for horde control and you can keep the rest of the talent the way it is without changing anything.
I think this is fair, because using this talent heavily nerfs your backstabs on elites and monsters already. So keeping the invisibility even if you attack something is not a big deal. This way you can enter an horde and start slaying it from within safely for a couple of seconds. If you try this currently after the first swing your invisibility goes away and you always end up getting hurt by the horde, so I can confirm the talent is 100% useless and not fun in most situations. In fact this talent is a huge nerf for Shade, because she’s not an elite/monster slayer anymore with this talent equipped.