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Does your character feel some what underpowered or not seeing the statistical increases from skills?
Well, many of the skills within the class are bugged.
1: Teleport Strike: Often when using this ability character will preform the animation, but will not teleport to the target. This may seem minor, but this will effectively drop you out of stealth and break invisibility. Same can be said of the Ambush morph and apparently the snare on the Lotus Fan morph is not working.
2: Mark Target: NO damage increase on it or any of it's morphs. All other functions seem to work fine for it and both morphs.
3: Haste: This skill is not increasing light or heavy attack speed when used with a bow.
4: Pressure Points passive: http://forums.elderscrollsonline.com/discussion/72460/nightblade-pressure-points-not-working#latest
6: Shadowy Disguise: Only applies bonus to weapon critical. Tooltip doesn't specify that it's weapon only.
7: Veiled Strike: Occasionally suffer from the same issue as Teleport stike.
Just giving you all more heads up of what I and every other Night Blade have experienced within the game.