berserk isn't much of a godsend either, you can't really use it for tanking since it resets when you take dmg, which also makes it less useful if you end up getting hit by an AOE. Then when you do get hit by said AOE it's worse then those around you cause of the reduced DEF lol.
As noted above Rampage does have a big downfall, being that it does reset with Steel Cyclone, and SC is the combo move you do in front of you, which is the usual position you are in when tanking a mob. So it's pretty well balanced lol.