Pretty much like a TED talk. Actually, if you look up TED talks about how to be an effective speaker, you will find the advice to talk in simple language and to use metaphors. Also, they advise you to throw in sentiments to which your audience will agree.
2. His often repeated „life is suffering“ is in the presented totallity not a useful nor true worldview. Life is suffering and joy. (I say this as a pessimist.)
Do you actually think he says that life is only suffering? Sorry, but that seems like a deliberate misrepresentation of his views. What evidence do you have that Dr. Peterson is anti-joy? Here's an exercise: find evidence in what he says that shows he values joy.
3. If you then check out his reading list you find mostly very disturbing titles and no silver lining.
Let's go right for the most disturbing: The Gulag Archipelago. It's disturbing as an indictment of the worst human beings can do, while those same people are spouting the most positive sounding utopian ideology. It's not going to depress anyone in the West, unless they have already tied up their identity and self worth in a similar ideology.
As for a silver lining -- to buck up, bear your burdens, and strive to live a worthwhile life -- strikes me as a worthwhile and positive message.