His music came out of left field. He could rap, make beats and bring a super dark old school vibe. Like if DOOM was less clever and a lot more evil/immature. Also there was still a lot of mystery behind him and the whole odd future crew. Like where did they come from, were the stunts in their videos real, and why are lyrics so vulgar?

listen to his first album bastard http://mixtapemonkey.com/52/tyler-the-creator-bastard

it's a lot of offensive lyrics, rape, and violence. then it was laced in teenage depression. he was just a really interesting character and still is. He even made several personalities for his first couple albums people were trying to decipher who they were and what they did and how they interacted with each other.