Confirmation bias aside, he's actually been far better than many we've had in decades.
That's confirmation bias. The first thing he did was hire bankers to solve the banking crisis. Instead, he should have listened to wise people like Paul Volcker, who said, "Any company that is too big to fail is too big to exist. If a company needs government bailout money, it should be broken up and sold off in pieces."
ACA was a step in the right direction if you ideologically favor government control of healthcare, and it did help some people without healthcare, but it would have been cheaper to just buy those people healthcare (also, the law was so poorly written it took heroic interpretations from the supreme court to save it).
He favored gay marriage.....once it was politically expedient.
He got us out of Iraq......then back in, in a worse situation than when we left.
He started a war, then messed around in another war, and stuck his foot into situations he didn't understand, making a mess of things (Egypt, Honduras).,
He promised transparency........of all the things he promised, that was the one I most hoped for, because it could have the biggest effect. Fail on that point.
He failed to get his trade bill, which is either good or bad, depending on your ideology, but it shows his lack of competence for working with congress.
He did do some good things.....I would say he helped improve race relations, and personally he seems like a great guy; but overall, we haven't had a competent president in over a decade. It's depressing enough that I am voting, not on party, but entirely on competence. Right now there are a couple candidates from either party who I would be willing to vote for.