Oh, that's crap!
The ability gets worse from update to update and limits its usability for different types of play.
Especially considering the hybridization and the “play as you want approach” it had more potential!
For example, in the last updates you also had the opportunity to use this ability as a ranged fighter, as + 10% damage for all attacks suited every build depending on the situation.
Now only melee fighters who want to use this skill as spam benefit... and no others like weapon types or similar...
1. It was best with the + 10% damage (without being linked to a buff) which gave the class a peculiarity (comparable to the Arcanist's 5% from the ink of the tentacles.)
2. then Nerf. for greater frenzy (also 10% but nothing of your own) If you already had the buff straight away - 10%
3. and now no more general buff (means clear direction is given -> up to 20% more damage for melee fighters, ranged fighters get nothing)
Why always these complete revisions with different approaches, if something is too strong you can first go to the numbers.
e.g. with 1. 10% individual damage buff on everything is too good -> then I go to 8% or later to 6%...