User blog comment:ThatPrimaryGuy/Thoughts on Nocturne/@comment-6006137-20140421120650

Or poeple could finally catch up to me and start playing him AD assassin mid... You dominate most lane matchups and when you do not use your ult to be the primary engager, you can wrack any carry of choice while having enough defense to stick around.

The reason his ult has a huge cooldown because it has one of the best, if not THE best, effects in the game: 100% vision removal. No enemy knows wtf is happening, might panic if they didn see him with a ward anywhere and he has a garantueed dash that, when built with AD, hurts a LOT. In lane, I usually favour to use it to finish low health enemies under tower or to pressure their jungler by jumping on one of their buffs. Endgame it's more the dash then the vision, but the range and point-click-success is so great, it's more powerful people think it is.