Trump is a fascinating character and I think people often underestimate what he's capable of. Like I wrote in another thread, he has a sort of inscrutable pseudo-intelligence to him; good observational skills paired with a freely associating mind that often leads him to useful insights that escape others.
But he is very problematic for a lot of reasons, not the least that he is easily distracted and largely uninterested in governing. He is also unprincipled to his core and easily influenced by those around him, typically whoever was the last to leave the room dictates what he believes on any given subject. If you look at the resumes of the people he has appointed they are unlikely to make choices that will lead to any kind of long-term benefits for the US. You might get a short-term economic boost from tax cuts, cuts to environmental regulations, infrastructure spending and deregulation of the financial sector, but the effects of those will pass and lead to more problems down the line. The infrastructure proposals he has come out with are essentially tax breaks to private investors, which will lead to an uneven allocation of capital. Basically, infrastructure projects that have a high utility but are not necessarily profitable (like maintenance work) will get less priority.
IMO there is a significant (20-30%) risk that the US will see a major armed conflict with another sovereign nation during his tenure. He is very bellicose in his rhetoric, not to mention tactless in diplomatic affairs, to an extent we've never seen in a US leader before, and tensions might easily blow up into armed conflict if the wrong sequence of events comes to pass.
Just the question of climate change alone should make you deathly afraid of the effects of a Trump presidency. His cabinet is full of people with interests in the oil industry, and while some of them do believe climate change is real (Tillerson), chances are they are mostly content to keep pushing more carbon into the atmosphere, thereby trapping more heat, acidifying the oceans even more and leading to stuff like soil erosion, reduced fish populations, less drinking water et.c. This will lead to more tension and risk of armed conflict around the world, as resources become more scarce and the world population keeps growing.
He hasn't divested himself of his business interests, won't be doing it, and indications are he is already being influenced by it. For example, rumors are that he brought up a permit issue for a project he was invested in to the Argentine president during a conversation. With things like the Carrier deal you now have a precedent of ad-hoc transactions where individual actors end up with preferential treatment if they do what the President pleases. All this pushes the US more in the direction of an African dictatorship, where the guy at the top calls the shots based on however he seems to be feeling that day, and has personal economic interests that influence his decision-making. Lobbying work is likely going to be intensified towards Trump and the people who orbit him, and less emphasis will probably be given to making structural changes that have a long-term positive impact.
I agree that many modern leftists are extremely sanctimonious and condescending and that Trump's election holds a sort of visceral appeal as an ultimate "f*** you" to these kinds of people. But I can't help but feel his election was a disaster for the US and the world and that we will be feeling the negative consequences of this (a true "black swan") for years to come.