The skill is 'Rage' it is meant to be buff and therefore nobody should be able to use it as a debuff, it defies its concept. For debuffing resistances we had 'Oath of desecration' if I recall the name correctly. It was a nice skill and even nicer in the high tier form, where you could try apply it to a group of enemies. But this is the difference, you could 'try to apply' but they could still resist. But you can't resist against 'Rage' because it is treated like a buff even if used a debuff and buff always get applied.
But true, even if made friendlyonly it could be still be to strong. Therefore my suggestion would be make it last longer again, but don't make it guarantee crits. It should support crit-builds, but not make them redundant.
For Warlords my suggestions remain: Either making it only give 1 AP per point or just make it trigger only once per round.
The concept of "rage" usually involves "Loss of control". So far, this is the least ragey type of rage since you still have full control of how the character act and can still use skills like normal.
If you are silenced while enraged and can only basic attack then at least it will be a somewhat balance steroid (no AoE with rage build) and can be used with Warlord without breaking it (since you can no longer wipe the whole team and gain more AP than you lose in one rotation). It will also tone down the power of the rage-build and allow Knife to climb back up as the single-target type of physical damage because atm, it performs no where near Ranger (Rage build with range and even some multi-target thrown in like Ricochet) or warfare.
