Pros:
His “I don’t care what the fuck they say about me” attitude (or, less favorably, persona) is a bit refreshing.
His stated desire to focus on reducing debt is good (all other things being equal).
He is (presumably) not bought and paid for by special interest groups
Cons:
He makes stuff up on the fly with little or no information (example, his comments that S Korea doesn’t pay for US military defense, when in fact they do, politifact.com/truth-o-meter … us-troop-/)
Connected to the above is that he doesn’t think before speaking (example, his comments on women and abortions, which he later retracted)
Also connected is that he regularly hyperbolizes for rhetorical effect, demonstrating his interest is more aligned with showmanship and getting an emotional reaction than with being factually accurate.
He lies a lot (examples, saying he never offered to pay legal fees for someone in his crowd to punch protesters, which he did say, or saying he never said women should be punished for having abortions, which he did say).
He openly says he wants more torture and killing of family members of “terrorists”, putting us on the same moral plane as groups like ISIS who actively torture and murder innocents. Furthermore, torture isn’t an effective method of information gathering and is rejected by the military for this reason, not even to speak of moral reasons against it.
He advocated for US troops to ignore international law and then later said he would always follow international laws. (He is inconsistent with himself).
He denies global warming and misrepresents information on the subject (example, he said “back in the 20s… There was global cooling” when really this was in the 70s not the 20s, and really was about the newly developing science of global climatology which, now, we have tons of data and evidence for global warming temperatures. So basically a deliberate cherry picking of data and ignorance of the reality of the science involved).
He wants to ban an entire religious group from traveling to the US, which is not only practically impossible and seriously harmful to the US image and how people view the US, but counter to the evidence (I.e. all or most Muslims are not a danger and in fact the best way to prevent radicalization is through forging stronger community ties and more inclusion/integration efforts, for example in UK it is only Moroccan and not Turkish Muslims who radicalize, which follows the lines of economic disparity differences between Moroccan and Turkish Muslim youth in the UK).
(Not that radicalization shouldn’t be combated, or not that Islam doesn’t have deplorable aspects, but that his approach would actually make the problem worse. His statements directly benefit ISIS as recruitment tools for radicalization by confirming that the US is in a “religious war” with Islam, which is a selling point of terrorist organizations to Muslim youths).
Building a giant wall is a stupid idea. Again his solutions to real problems are impractical and absurdly simple-minded, like something a child would come up with.
As one foreign policy advisor put it (can’t find the link now), his approach might succeed at extracting a small bit more “piece of the pie” for the US from international trade, but at the risk of exploding the pie itself (Trump treats negotiations and international trade and military aid as if these were zero sum games when in fact they aren’t, case in point of how we gain many other benefits from helping S Korea with its defense then simply being paid by them for it).
He has an orange face (maybe less relevant I’ll admit…) and makes sexual comments about his daughter (“If I weren’t her father…”). It’s one thing to see the whole “saying what everyone else is thinking but afraid to say” thing as a virtue, but obviously there are limits to that. Even if his “I’m an asshole but at least I’m honest” persona is appealing in other contexts, as a president presiding over complex arrangements of relationships with allies and foreign countries and economic interests this would be suicidal and not a desirable characteristic of a leader, at least not at the level he examples it. Plus as I’ve already covered above, he isn’t honest anyway. He’s just going for immediate shock value and trying to get a rise out of people (he is crude, immature, childish, openly narcissistic).
According to former extensive interview article by Rolling Stone I think it was, he is a spoiled immature guy prone to fits of petulant rage (saying he has the best pilots for his jet and then suddenly firing them for a turbulent landing, for example).