Trump's debate style consists of smirks, calling people denigrating names and threats. All an opponent needs to do is call him on his lies with facts and act like an adult who is speaking to a child having a tantrum.
The Trump-Clinton debates are public record. Either your assessment is wrong, or Hillary wasn't able to act like an adult and use facts.
To be fair, that was then, and this is now.... two years is an age in politics.
During the lead up to the 2016, a fair portion of the country (almost half) thought he might end up being good President. They hoped he might grow into the job. Now, all hope of that is lost.
All Trump has grown into is a sneering, narcissistic, tantrum-throwing man-child; he is a (now) self-confessed "Nationalist" (and he's a racist, so you can interpret that as "White Nationalist"). He is also openly misogynistic and homophobic. He intentionally stirs up racial hatred among his base, and calls them "fine" people when they beat up and murder those who oppose him.
Additionally, he craps all over your closest military allies, while embarrassingly licking the boots of the world's two most dangerous terrorists - Vladimir Putin, and Kim Jong-un, both enemies of the USA.
Meanwhile, having screamed and yelled at full volume over Hilary Clinton's private email server in 2016, and how it was this big fat security risk for the country, in 2018 he happily uses his insecure private iPhone for White House and Government business, allowing China, Russia and probably North Korea to eavesdrop on his conversations.
But by far the worst aspect of this man's Presidency is not actually Trump himself, its that a fair percentage of Americans (including yourself, it seems) are happy with this state of affairs; happy to have a Fiddle-playing Emperor running your country into the ground, rapidly turning it into a banana republic, while a large number of you look on and cheer. You do know don't you (at least, I hope you know) that Trump, and GOP, are trying to change the US Federal Law Enforcement structure so that the FBI is directly responsible to the President? Dog help you all if they succeed; the USA would be one helluva Police State!
Much of the rest of the Western world used to look to the United States of America for guidance... "what do the Americans think?" has been a fairly common theme in other countries for the last 50 or so years. Well, not any more. Now we look to the United States and wonder what has become of it, and worry about where it is going, and what will happen.
Trump hasn't "Made America Great", he's made it into a world-wide laughing stock, and is well on course for turning it into an international pariah.