This is either for pug-stomping or for a good premade that can manage to keep the slayer alive in Red zone, although i used it while soloqueueing SCs and had some fun

Another one is solo/duelling one, where Power Through allows you to use Rampage/Enervating without losing damage or delaying Incapacitate.
It also lets you burst the target down after the KD, and gives you the option of Precarious Assault spam in yellow zone which deals pretty scary damage.
In solo roaming situation you usually dont fight for long, and have enough time between engagements to drop the Rage naturally, so Berserk penalty isn't as big (and against enemies like Chosen, Magus or WE it doesn't even change anything because they debuff or ignore your defences anyway)
There are also for fun "spinning axe" build - Short Temper + Power Through + Wild Swing spam