Nocturne is op.. Ofc release date noct was broken af. His ult was half the map. He's still a very strong pick and no he is not countered by armor. Your build just sucks.
He's op "in the right hands".
What i'm sayin' is that he's not a "1st champion in the game to try out".
He's pretty powerful and has alot of potential(a little like eve).
However not everyone can master him.