i dunno, depends on the enemy, i can still do the 2 in 1 fusion rifle bounty on dregs and thrall, and anything bigger is 2-3 shots. Fusions IMO are better than shotguns in PvE for the most part. I still say the charge rates are what kills them for most people, they are not a very good reactive weapon, you have to sort of plan your shots and its too easy to miss and then get screwed because of the charge rate.