Alright, first Sword Oath, it might be augmented by some stats, still it has a potency of 50 and as the skill says "Increases the potency of auto-attacks by 50". And on top of that, it doesnt effect anything else at all while Darkside increases ALL dmg by 15%.

My Problem about flash isnt the blind. its the amount of enmity and the costs to keep up your enmity on many enemys while a group is bursting AoEs for example.

Clemency, as i said before, while you're MT this skill cant be casted most oh the times since you get interrupted, and even if you're OT its your job most of the times to keep some people save from adds or something, not standing around healing. if a situation gets dangerous your ability to tank is of much more use than to heal.