If you don't think organizations know about what a players on ice and off ice charaxterisitcs are you guys are mental. The hockey world is a very small world and there is no way people don't know everything about a guy before they draft him.
The 5 to 10 min interview they do is to get a better idea of what he is like as a person in a very general sense which leads to judgements about character. I'm not sure about everyone else, but when I go into an interview for a job, I am pretty sure they are judging me based on what I say and if they want me as an employee, this is the exact same thing.
It's not 5 mins of talking that makes the judgement on a player, it's 1 or two years of asking questions to people they know. But, while it's impossible to make a 100% accurate judgment on a players character in 5 mins, that's exactly what they do. The teams that judge character best are the ones that win all the time. Give The Red Wings 5-10 mins to talk to a kid, they will know if they want him. Impossible to be accurate, not impossible to make a very educated guess.