You should add general incompetence, corruption (the Russia thing happened so going forward, the only concern is what it says about his character), and negative impact on the dignity of the office and the country.
It's kind of hard to separate, though. The economy is doing pretty well at the moment, but I have zero confidence that he'll respond intelligently to a downturn. Regressive changes to fiscal policy, badly thought-out deregulation, lax antitrust enforcement, reduced high-skill immigration, and other proposed changes could actively torpedo things, too. Also, bad Fed appointments (inevitable given his incompetence) are a potential concern. On the other hand, all of those things are concerns with any Republican president--even a relatively decent, and intelligent one like Kasich or Romney. Ditto for healthcare (that is, he's a threat to people's healthcare, but almost any Republican would be). So you have the ordinary bad stuff on one hand and the uniquely bad stuff (acting like an idiot on Twitter, generally failing in the head of state role, possibly bungling us into nuclear war) on the other.
The ordinary bad stuff is more likely to hurt the country to at least some extent (though his operational bungling is a positive in this area) but the uniquely bad stuff is more likely to cause catastrophic harm.