If you can't tell that Trump has serious psychological/personality issues, you are stuck in a partisan well or clueless.
Read the profile on him by the guy who was writing his books for him. He's lazy, impulsive, ill-informed on most subjects, has no attention span, and almost certainly has Narcissistic Personality Disorder.
No one really has any clue what a Trump presidency will be like, because Trump has no clue what he'll be like tomorrow. There's no real way for it to be good, but an unpredictable number of different ways it could be really bad. I have a hard time imagining him making it 4 years without impeachment, not matter which party controls Congress.