@ Fai Everything you just said, basically proves my point. You have wisdom and intelligence mixed up. I agreed, and stated above that Ichigo is exceptional as a fighter and tactician, and his ability to master new Fighting techniques is second to none. He has outstanding instincts when it comes to fighting and being able to understand your opponent on a physical and emotional level. All the things you listed ,except for the school grades, are characteristics of being a great fighter. However, that does correlate into intelligence. Ichigo is WISE beyond his years, but Not even in the same class as Urahara, Aizen, or Ishida in terms of sheer intelligence. This is shown time and time again when he has to do something with finesse like manipulating Reishi. He has an extremely difficult time with even the most basic tasks i.e. building a walkway into Hueco Mundo, or controlling his spiritual pressure like he needed to do the first time Ichigo and Co. invaded soul society. Ishida, Chad, and even Inoue had completely mastered it, and it took Ichigo all night to become even mildly proficient at it. Also, in every battle when his opponent starts talking to him with even the slightest subtle in their words, rather than try to have a intelligent discussion, he just tells them to shut the hell up.
And as for being at the top of his class, i'm not even sure if that's correct, but if so, it's because Isshin rides his ass all the time to become a better student.