jungle Advantage over Eve- This is assuming he has faster clear and able to gank more easily? This is what it means to jungle. Sorry to say but this is not true. His clears are terrible without setting up his boxes first. He can easily be kept track of by placing deep wards in order to predict when he will gank. On the other hand, eve has insane clear speed and immense pressure if not kept track of. One of the few ways to counter her is to place wards at her buffs/camps to keep track of here, even then you can't know when she will gank. Investing in vision wards do not help greatly if your laner finds them and you can't compete for it since you don't know whether or not eve will show up. Everyone has low cooldowns if stack CD Items, but tell me what are good cd items on shaco?
Difficult to kill? He is one of the squishiest champs in the game. Not many people can even control the clone to imitate a player. Simply put some aoe spells on him and hes toast. It's so easy to detect which one is the real one based on the movements. 1 spell cast and hes given away. You can't cancel aa animations on two champions at once ( if you can, gratz to you). And if he sends both himself and his clone into a fight, he's risking at his death. If he runs away, people instantly know which is the real one.
Shaco is not an overpowered champion nor is his kit broken. His kit requires insane skill in order to utilize correctly. Only then is he an "annoying champion". Just like every other champion he has his own weaknesses and strengths.