Itachi has been shown to be analytical and perceptive, being able to deduce the inner workings and weaknesses of powerful techniques, even while under pressure.
He orchestrated his battle against Sasuke to bring about his desired outcomes, and even account for the possibility that his plan wouldn't go as intended by sealing his power into Sasuke and placing a special crow inside of Naruto Uzumaki. Even Tobi himself admitted that if he hadn't kept a few secrets from Itachi he would be dead.
On top of his perceptive skills, Kabuto also noted that Itachi possessed skill in deception due to Itachi's ability to read people's feelings, and this made him a ninja of lies up until his death.
Itachi worked out and disabled the shared vision of nagato with mere kunai, figured out chibaku tensie. more importantly kakshi would never have been able to use a plan to end edo tensie.
two things.
-the arguments for kakshi have been much weaker than itachi's so using the word 'fanboy' has brought the point of this thread down
-work on your grammar it sucks.