Let's see:
Unemployment massively rising, gas prices going through the roof, he pisses off our nation's allies while simultaneously sucking up to our nation's enemies, he badmouths his own country in front of said enemies, he demonstrates enormous hypocrisy between his words and his actions as he parties it up like a king on exorbitant vacations all the while regularly giving long- winded speeches about how regular Amerians need to make sacrifices in their lifestyles (A good leader is supposed to set a good example for his people, and practice what he preaches; Obama is an immense failure at this), he is quite deliberately turning the American people against each other through his promotion of class warfare and race- baiting (And this is the president who was supposed to be the Great Uniter who'd bring the country together), and demonstrates supreme arrogance and narcissism in everything he does.
I'd say a solid D- for him.