I would say it's closer to bad in the sense of if the boss is too weak to pop it in the opener, like in E6s, your opener gets completely messed up and it's simply out of your hands. Now if it worked like SAM's Third Eye where the effect pops on any hit, then it would be better but still not great cause then you'd end up using a Dark Arts charge instead of Mp in the opener which would lead to overcapping. So then Dark Arts would also need to be changed to be used on something else entirely. It's kind of a mess.