New fervor vs. old
I think Fervor of battle was much healthier being on-hit damage rather that giving AD stats.
Being on-hit was great for on-hit champions, tank, fighter, marksman, some mages -any class really! And also for auto-attack champions (who don't necessary rely on AD). It was a great mastery, it was situational for many champ/playstyle... it was also very healthy!
Currently, in my opinion fervor is broken, it is very niche, and for many champions who where reliant on the old on-hit fervor, there is currently no good keystone mastery.
p.s. Sorry I posted this on Story, Art, & Sound before, my bad.