I don't like that he was elected, but I do prefer him to his VP Pence (Trump strikes me as a narcissist, but that's still preferable to me over a religious zealot like Pence driven by his conscience to do what I consider horrible things). Now that he's POTUS I'm going to try to give him the benefit of a doubt and hope he pleasantly surprises me. If he can't pleasantly surprise me then I hope the checks and balances can keep him in check.
I was very pessimistic about an Obama presidency, but within a year I decided my judgment of him was too harsh, and by 2012 I found myself pleasantly surprised by him. Sure, he was flawed, but I don't expect saints that get as high as the Oval Office, and it's most likely best that someone can compromise (which means bending and sometimes making unpalatable deals, which idealists and ideological purists tend to call "crooked"), and it annoyed me that some of the people Obama was trying to compromise with were clearly more interested in making him fail (even if it hurt the USA in doing so, so long as Obama got the blame after he bent over backwards for these people). I can list moments I was annoyed to offended to disappointed in President Obama, but overall I felt he did as good a job as he could given his circumstances. But then my expectations were pretty low for him as he started in 2009 so it wasn't hard to pleasantly surprise me.
I'm expecting bad things from President Trump, worse than Obama, but that just means it will be even easier for him to pleasantly surprise me. And I really, really hope he does.