There is a tendency of people to protect their party by diverting to others, and we see that in this thread, not on your part, but it's here. There have been many things that Obama promised that he ignored afterwards, and is ignored by those who support him. Warrantless wiretaps, justice regarding Iraq etc. In fact there are people who cannot mention anything negative regarding Obama without dragging in Republicans in an attempt to mitigate. That's a poor rationalization, because Presidents and everyone else for that matter are accountable for their actions or lack thereof. Obama's predecessor Bush had his fanboys too so this isn't unique to Democrats, but over the decades it's worn thin. It's always someone else who's accountable, and never look at the man behind the curtain, if it's "our guy".
Consequently the answer is that Obama will never be held accountable in any real sense, just as Bush wasn't. More importantly note that while people complain about past administrations those in power never hold them accountable, because if they did then someone might do the same to them. One hand washes the other, and that's a terrible way to handle politicians in anything that's supposed to be any form of democracy.