I use this skill first and it does enough to fuel my Galrath Slash/Final thrust combo, and with those two happy skills burning away I hit Power Attack right after Berserker starts flashing then Galrath which usually takes most monsters down to 50% or lower, then give them a final thrust (Still burning from Beserker stance) and you get the below 50% bonus damage with Final thrust, it's a pretty effective combo and 4 attacks I always have on my bar.
This skill is trash. 30 second recharge is terrible for an attack speed buff and you can't spike with it making it as bad as battle rage and worse than tigers fury.