Most people don't like playing tank. Everyone wants to do loads of damage, even when they play tanks.
And that's okay, that's natural. Sadly, tanks are useless in this game and mages can help the team survive better. That's a big design mistake.
You could be on a team full of complete idiots who all die except you, and me with my Legionnaire. And we could defeat the final boss just the two of us.
Also I like Combat Roll because it gets rid of status effects and lets me escape those stick men from the elven ruins, shrug off enemy mages and even lets you run in circles around the Templar Commander, not to mention making it easier to move around the battlefield and cut off enemies that try to attack your ranged party members.
I was a little confused about the description for the upgrade to Counter strike, thanks for clarifying it for me guys.
I think Challenge is underrated. Seems to me like it has a more powerful taunt effect than War Cry and the upgrade that lets you restore stamina is pretty great. When I combine it with the abilities I mentioned, it feels like I'm not going to need the Fortress ability because I do have the passive you unlock before it which gives you a few seconds of invincibility at near-death.