As a Guardian Fighter who just unlocked this power, I can totally confirm that it is bugged as to be totally useless. My character charges forward, but instead of colliding with an enemy, he just passes through them, then does a "striking" animation, then nothing.
I was hoping they'd finally fix the absolutely-useless-because-it-has-no-effect-whatsoever Line Breaker Assault power of the Guardian Fighter. Sad to say there's no mention of it in the patch notes. Oh, well. Another long wait before us GFs can use our supposedly top-tier power. >.<