Yes, he's a great TV personality and he does know hoe to sell himself to the masses, not because he has anything good to say, but simply because he delivers what the masses want to hear and see: "feel good" advice. His ideas don't help you much (maybe except the general: "live a healthy life"), they are usually pretty generic and not tested out, but they make you feel like you are in charge, doing something (anything) to get yourself in a better shape.
His problem is not only the fact that he peddles unproven therapies and medicine, which can be harmful in itself; his greatest sin is that he promotes other people who are filled with nonsense to the brim and who'll sell you their dangerous medical advises at all cost, even if it really means harm to you.
I'd say, skip Dr Oz's programs as they are not reliable source of real information.
As always, Orac has the best take on Dr Oz on his blog: America’s quack: Dr. Mehmet Oz
Here is the best description of who Dr Oz really is (in his own words):
King finishes by asking Oz to respond to the idea that doctors should be optimists and that no doctor should tell a patient that he is terminal, because “no one knows.” To this, Oz responds that we “actually have to be more than just optimists, but irrational optimists.” Well, Dr. Oz has the irrational part down cold, at least when he’s on his television show. Sadly, my original quip about him becoming more like Mike Adams turned out to be more true than I could ever have imagined.