I have 2 fighters in the party I'm rocking right now on Hard, one full tank spec one two hander with some reasonable toughening though much more damage focused. Both fighters have 3 knock downs, one with clear out (the 2H user). I find that the tank is definitely good, but the 2H keeps up in damage no problem and I have a stacked Rogue in my party - definitely *not* MORE damage than the Rogue if you're just looking at strict output, but if staying power is factored in the damage consistency is huge. Having 6 knock downs per encounter is massive CC even without it being AoE; most things get steamrolled on Hard. If my front line gets broken or I'm surprised from a flank, the extra metal in the party is great, especially with those bonus knock downs to break engagement on a squishy so they can back up a few yards out of harm's way. Importantly, having things knocked down all the time prevents a large amount of Health attrition and keeps me gaming longer without having to drop camp or run back to an inn.