Black Knight Irios
Explorer
I think that main problem are feats like Slashing Storm and Marked Scourge. Prior to Dual Strike and Marked Scourge nerf, fighter (defender) could have DPR comparable to Ranger.
Why did the designers decide to publish Slashing Storm? + Wis to damage on two best and most suported classes? Sounds insane.
Incidentally, that makes fighter multiclass even sweeter for Avenger, as if things like Rain of Steel weren't good enough.
Slashing Storms deals not +WIS damage when you attack, it's auto damage at the start of enemies' turns, so it happens 1/round per enemy. It is not Pit Fighter 2.0 or something like that.
RoS and Slashing Storm get better the more enemies sourround you and the longer the fight lasts. If you want to finish fights quickly you should watch for more frontloaded damage options and options that work with multi-attack powers.
BTW, we're getting off-topic.