I like him in small doses. He is amusing, but his greed and incompetence are just not good for the city. And as we've seen in The Giant Bacteria, his cowardice can lead him to endanger others. In fairness, he was admittedly scared out of his mind. He reminds me in many ways of Gennaro, the lawyer in Jurassic Park; like Manx, Gennaro is presented as a comedic character and kind of a dullard, and eventually winds up doing something shameful in an act of pure panic when he runs off and leaves Tim and Lex behind. Unlike most people, I forgive the guy, because panic isn't the same as malice. Similarly, I forgive Manx for knocking Callie off the rescue ladder because I understand that the reason he did it is simply because he was terrified and not thinking clearly. But understanding isn't the same as condoning, and if Manx is a person prone to wild, unthinking panic in a crisis, he is unfit for his job.
R.I.P. Gary Owens (1936-2015)