it's a multiplicative bonus where as berserker rage and brawler fall into the DIBS so they're additive and are watered down by other + damage affixes
Also, it's "on" all the time (unless you are one shotting mobs) where as things like berserker rage is only useful for certain builds because you need 95+% resource for it to be on. Brawler requires 3+ mobs to be within 12 yards, which isn't always the case either. Again, both are additive.
This post was edited by rlebar on Jan 28 2016 02:20pm