Character is very important. it depends what you meant by good character. No one has 100% good character, but those you might be thinking do not have "good character" (I guess you mean behavioural) must exhibit an excellent character to that talent which they possessed that made them excel.
If they don't, it is only a matter of time until someone with lesser talent or equal talent but better character shows up and they are forgotten.
We have seen with our eyes in football for example a lot of players with exceptional talents that are unable to live up to their potential because of their character
RE: Character is Crucial