Ice breaker was nerf ed in y2 due to its ammo perk being overused in 3v3 playlists in pvp when they took special ammo away to begin the match. Though, there's been so many nerfs on everything, I can't remember if it got nerfed in y1 or not.
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True, maybe not so much ice breaker, but black hammer became a shell of itself as an exotic in the black spindle because of its popularity in pve.