Well I'm terribly sorry that I prefer the benefits of the Ice Breaker, even though killing a boss could take me marginally more time, making little to no difference in the end. And besides, I can switch weapons which is faster than reloading and still deal considerable damage with my Scout while the Ice Breaker charges without me having to do anything. And funny thing, I kill Atheon in just as much time with my friends. Though the weak spot on Atheon can be a minor pain. I every so often run into a shot or two that apparently didn't hit the weak spot, but then shoot off to the side of him and it counts as a crit. I use Ice Breaker for nearly everything because it rips everything apart for me. The only time I don't is CQC in the Crucible.