Not finding damning evidence when there isn't any doesn't make you a bad investigator. Comey`s sins are that he new the timing of his last Clinton investigation was terrible. All the blame wasn't on him, ignoring the information or presenting it would have been him in the ass either way. That doesn't say that the man is completely incompetent and considering that his current statements have been corroborated there is no reason to call foul, yet.