Sasuke is now going down by the path Itachi went through, it'll probably become more clear once we learn a bit more about Itachi's reason for killing his clan. and after that point, Sasuke might have a change of heart and go Kakashi-like...

Naruto also didn't work that hard for the Kyubi power, he just fell off a clip and then magically gained control over it (there was no step by step learning in it, it was a sudden realization of the power). Sasuke also hadn't work hard, by neither did he get it as a present, nine of every ten die from this "present", and only those with enough will and ambition can wake up from the shock...

don't forget that the curse seal uses your life energy, so it eats you away...