It's decent for anything that has a bigger crit spot. What about bosses that move around a lot, or if you NEED to get a shot off for whatever reason is and you can't get a total aim. So you get two crits and one hit. Bye bye buff. Also, what if the enemy doesn't have a crit spot? You should test it out on a boss that doesn't have the biggest crit spot and just floats around. Ice Breaker's regenerating ammo is simply the most helpful perk in the game in my subjective opinion. And while I find myself cursing at it not regenerating fast enough, it still does a stellar job if you pace yourself.