Well, that's largely because you live outside the country. Despite what Hus says below, and outside of his nagging habit of drone bombing tons of innocents, his foreign policy has generally been decent because he doesn't practice American exceptionalism. Contrast with his predecessor, George W Bush, whom much of the left here felt was -- on international relations -- our answer to Vladimir Putin with a drinking problem. (Isn't that nice?)
Chances are your academics are probably more left-leaning. Which means they see Obama as a blown opportunity for reformation, etc. He's failed at a number of competency issues, which is true, but not much more than your typical president, IMO.
The reason for any hate you experience probably stems from the fact that putting a black man in the presidency doesn't mean every African American gets a $10,000 reparation check, that he has been nagged with bad policy decisions such as being the "drone president", and that no one person is really all that capable of changing the billionaire cronies who are ultimately in charge anyway.
"Idiot" is kind of comic given his predecessor by comparison. He's made more than his share of mistakes and dropped the ball agonizingly on a number of areas, but the guy is book-smart. He has not been very much in the "political savvy" category, which requires a calculating cunningness he hasn't shown.
Part of that, and part of what we see of him now, is I think he's fed up with Capitol Hill politics and can't wait for it to be over.