The whole set up of the class provides very little in helping bring fights to a close, and from my party's quick arena death match yesterday, I kinda wished we had a Fighter or Monk instead to draw the fight to a close faster.
So Ferocious Vengeance is very nice, a very good damned-if-you-don't...
...but we are missing the damned-if-you-do! The class is missing a "you hit me, now I get to put some extra hurt" somehow.
Namely, it would make a lot of sense to have a "Come Get Me" reaction from Taunt -- it's not easy to get off, so some way to punish those who actually hit you would be great.
This all being said, it's hard for me not to want to see both Threat Techniques as necessary for the class.