If anything, this show shows cops in a very bad light. But for a 'consultant' (what the heck is that, btw? I've never heard of such, unless it's for a skill not employed by the cops - say, a doctor of special kind, etc), this 'CBI' must be unable to solve anything in their jurisdiction! They barely get moving on their own, and while all the 'bosses' (Lisbon, etc) bark commands around, the underlings' leg-work is simplistic to the point of ludicrous. And Patrick Jane 'finds' out stuff a real cop would be embarassed to have missed; eg: when a burnt car is found, they need Jane to open the glove compartment, fish out an un-burnt piece of paper, and voila - it has a thumb-print in blood!
Left to myself, I would not be knowing much about this show, as I'd be done with it after an episode or two, but my wife loves it - because it does not demand too much thinking, and has a running theme ('red john') and also an episodic ending (a crime solved each week).
Now my daughter has caught an interest and sneaks in to watch at times. I can definitely appreciate that it'd have a lot of appeal to 14 year olds, but can't fathom any for adults.
But whenever I'm a captive in the room, I find it amusing to point out the villain early in the episode, and have almost never been proved wrong. The show specializes in making the bad guy very obvious, right at the get-go, so maybe their audience is the teenager group?
Now who 'Red John' is, is not easy to guess, just because the show does not seem to have any idea! They have changed their minds too many obvious times. As of now, looks like its gonna be not a single person, but a group of people together...? But that could change any time.