I may get killed a about half the time but every time I face a BD using arc blade I kill him with a shotgun headshot as he lunges at me. Pretty easy, plus I'm a BD and its not as great as it looks. Sure if you get lucky you can kill an entire time but 1. You have to use it while your close or you could go the whole time without seeing anybody and 2. If somebody hears you activate it, you will get supered by a Titan or warlock the second you take a corner. Plus I've been shot before it fully activated and nothing from it. I'm gonna create a sun warlock now that I know the game well cuz it feels like the perfect class for me.