I like the new Vengeful Blood mechanics. I agree that mana should only be a minor concern for warriors, but the old version was plain broken. And if the new version really doesn't give enough mana? The devs can just increase the mana restored per attack - no need to revert it to the way it was.

But let's take some time to adapt, first. I tweaked my build a little and gave it a spin. I only ran out of mana a few times, partly due to poor skill timing. Luckily, I accumulated over 500 free mana potions from allies when the old VB was showering me in infinite mana.