But that is hardly the point, most of the media told us for months that Trump wasn't a real candidate, then he wouldn't win and that Clinton was the only real candidate and you had choose her. They published tons of positive articles about her and tones of negative about him.
In a general sense this tarnishes their credibility, either they lied or they didn't know what they were talking about for the last 6 months.
Being wrong about who would win isn't so much of the problem, its more about being totally clueless about what was going on and what people actually thought about the situation.... They failed at their job of telling everyone what had happened.