It would be great if the berserk icon told you its state, in a tool tip; when you moved your mouse over it. Other icons tell you how long it is until they expire, in a tool tip, so this could be easy.
Currently, berserk can change state without you ever knowing, because NPCs can calm the Barbarian. A tool tip would be a great first step in knowing if you needed to zerk up again.
However, if the icon had a red fill that indicated zerk state, then no mouse move would be needed. You would know at a glance. For a current example of a fill icon, see the NPC hearts' state, as they take damage.
Berserk Icon - Adding Zerk State
Re: Berserk Icon - Adding Zerk State
This would make it much less frustrating to play a Barb. One thing that always bugs me is when I play in a zone where I get de-zerked by creatures, and all of a sudden I'm not frothing at the mouth so I die because I can't vamp. Having something like this would give me a much better indicator of my zerk status.