It's hard to comment on this without a bias.
All I can say is that it's funny that when something happens, it becomes normalized quickly and people forget how amazing and rare it is/was.
For a 70 year old man (who has never served in office) to run for the highest office in the country having never run for so much as dogcatcher and win speaks ultimately to the faith the voting public had in those currently serving and how they have represented the people. And, yes, I know he did not win the popular vote.
But, regardless, that election does not happen (no matter how much people want to deny it) if people are relatively satisfied with how things are being run. And this is on both parties. He had to win the primary first, which is more miraculous in its own way. A twice divorced, morally flexible (how do you liked that term) NY billionaire (who was formerly a member of the other party) won a plurality of evangelical voters in Mississippi in his party's primary.
His competence was not even questioned much. Jeb Bush did during the primary. Not many others actually did. His temperament was questioned, but not his ability to do the job. Not really. And one of the reasons was that he would have had no problem turning around and looking at whoever (either Clinton or his challengers in the primary) and torn them a new one over decisions they have made and policies they implemented. Hard to question a man about his fitness to be commander in chief when you weren't even able to keep classified information secured or you've supported a policy in the Middle East that has seen absolutely no progress toward any supposed goal that we had.
He won (IMO), in large part, because he had absolutely no fingerprints on anything that has transpired in government.
I spoke to one woman who was a Republican voter. You may like this story. She said she was voting for Trump. I asked her about Trump the man. She said he was an "***hole". I asked why she was still voting for him. She said her ex-husband was an "***hole" but he was very good at what he did. I asked her about his inexperience. She said....."if he gets us in a war that has no end in sight, doubles the national debt, makes health care unaffordable, and builds a wall.....he'd be no different than the last 2 presidents but at least we'd have a wall". There was no concern about him screwing up, because she had nothing positive to say about his predecessors.