(1) He has no record as a statesman. (although his businesses have a long history of fucking over employees and clients a la Trump University. That's just the tip of the iceberg, there's a plethora of less-interesting lawsuits about people not getting paid, deliverables not going out, etc)
(2) His position on issues changes on a near daily basis (It's a Muslim ban.... no wait, it's not a Muslim ban! His pontificating on that subject was actually used in the judgement that halted the initial ban... the competent Republicans at least try to hide the discriminatory/unconstitutional aspects of their policies, in the interest of getting them passed)
(3) His personal concerns seem to come before the nation's - No sense of patriotic duty. (Decades of tax returns still being hidden - is it because he doesn't pay taxes, or because foreign business interests have him by the balls? Probably both.)
Even if his actions could be predicted, and his campaign promises were consistent, I don't like a majority of them. Of the good things he proposed, many are either low-profile enough for him not to care vis-a-vis his popularity ratings (H1-Bs), or they are in conflict with corporate interests, which he's going to choose every time. Look at how the Keystone XL pipeline was approved a few days ago - his campaign promise was that it would all-American, built with American steel, etc... those requirements did NOT make it into the approval. That would hurt the oil companies' bottom line, and we can't have that.
What it sounds like is that you've been listening to (some of) what the man and his alt-fact cronies are saying, but paying little attention to what he is DOING. In other words, you got duped by a politician. As time goes on, people will become more familiar with who he really is and what he wants for the country, which is not going to help his re-election. I think one of Trump's strengths this election was his lack of a governing record - people could project whatever they wished for in a president onto him. As long as you didn't like Muslims, none of his speeches or rhetoric would acutely turn you off. For the record, I don't like Muslims. I'm never going to be close friends with a Muslim and some of their philosophies are downright disgusting to me. I'm probably prejudiced too - if I see a bitch in a hijab I'm not going to talk to her. What I am not is a fascist. I recognize that we can't legislate this religion into irrelevance, and that trying to do so will be counterproductive. Leave the mosques alone - the ones here, and the ones in Iraq. Just recently we had these airstrikes in Mosul that hit, among other places, a mosque, killing several hundred civilians. How many families are going to grow to hate America just from that one strike? I've actually heard libertarian types use our engagements overseas as reasons to vote for Trump - as if he will do anything to stop it. By the way, his budget proposal has the military's budget increasing by 10%. What happened to letting other countries defend themselves so we could reduce our budget? Another broken campaign promise, it seems. The arms manufacturers wouldn't like that. Corporate interests trump the nation's interests - again. And it won't be the last time. You will see this over and over.
We are still in the honeymoon period and his approval is already dipping into the 30s. Trump 2020? I doubt it.