The only positive notes of the Obama Admin was mandatory healthcare coverage, steady unemployment rate, and the execution of Binladen. However, depending on what side of the spectrum you view things from, Obamacare could be considered a bust that was full of lies, the unemployment rate isn't accurate since it only shows what number of those unemployed receive unemployment benefits, and he wasn't technically the one ultimately behind finding and killing Binladen. Again, it's how you view things.
There are plenty of negatives too, but that comes with all presidents.