3) Andrew Wiggins/Jabari Parker

These are the worst sort of irritants, because they become irritants in the easiest and laziest way in the book: not working hard enough to reach their potential.

Ironically, they were taken in the first and second picks of 2014, for their vast potential. Maple Jordan went to Minny, where he's signed a max contract, and Parker is now currently with the Bulls, where he's the highest paid player.
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Parker's most irritating vice is his complete refusal to play defense, and unlike Harden, be completely uncaring about it. He went so far as to say players weren't paid to do defense. Well, fast forward two weeks and the Bulls are trying to trade him, which should send a message: players aren't paid at all if they don't play defense.
Wiggins just never reached his potential on a consistent basis: his talent shines through in short bursts. He'll erupt for seven straight 20+ point games and go scoreless the next three.
Frustrating for Minnesota fans and more than a little irritating for his teammates, we can assume it must be maddening not knowing which version of Wiggins will suit up every single game.