Dean Baker has the right idea. Is the house better off than before it caught fire? If not, blame the firefighters.
On the other hand, yes, the house is better off than it was in the middle of its blaze. And that's where we were when Obama took office. The blaze was the Bush Administration's fault.
On the third hand, President Obama could have done a whole lot more if he weren't Republican in disguise, giving them pretty much what they wanted, refusing to fight them, poking his original base (that elected him) in the eye.