I don't mind being under the knowledge that my AoE is lacklustre against a Sorc or DK if I know that they cannot compare to my single-target DPS.
Here's what I'd like to see:
Assassination:
Teleport Strike - Lotus fan: Increased AoE Damage
Shadow:
Summon Shade: Make the shade(s) taunt a single target constantly, and give them enough dodge, armor, or hitpoints to actually tank that target for a short period of time to allow the nightblade to focus on something else, almost like a distraction.
Siphoning:
Strife - Funnel Health: Make it deal damage to the target and 2 nearby targets, while healing the player and 2 nearby allies. This makes it a multi-target damaging attack.
Agony: Remove the damage over time from this ability so that it can be repeatedly used on a target (that's the entire reason it has a DoT, to prevent you from mezzing a single target several times in a row). As a counter, make it so the ability only works on one target at a time. This would allow a nightblade to take one target out of a fight while concentrating on dealing with other enemies.
Drain Power: Increase the damage this ability deals to nearby targets, and make the weapon damage bonus also apply to spells.
Siphoning:
Strife - Funnel Health: Make it deal damage to the target and 2 nearby targets, while healing the player and 2 nearby allies. This makes it a multi-target damaging attack.
Agony: Remove the damage over time from this ability so that it can be repeatedly used on a target (that's the entire reason it has a DoT, to prevent you from mezzing a single target several times in a row). As a counter, make it so the ability only works on one target at a time. This would allow a nightblade to take one target out of a fight while concentrating on dealing with other enemies.
Drain Power: Increase the damage this ability deals to nearby targets, and make the weapon damage bonus also apply to spells.
It's not that I have anything against class systems or people and/or builds that fall within the classic confinements of Warrior, Mage and the Thief, but like many others, I find myself playing a different kind of class, one that's not exactly any of the listed above, but something entirely different.
In most RPG's they are essential, but I feel like the whole idea of TES:O is to break that golden rule in order to create something that's unheard of in the MMORPG genre. Being able to create any kind of build imaginable - that's not game breaking - is the very heart and soul of the game.