To me, this highlights that the Congress has done so little successfully that they have barely ever even had the chance for Obama to disagree.
I'd like to see a similar chart of # of total bills signed into law by presidents. I'm guessing we'd see Obama to be similarly low for the same reason.
Part of the reason for it, is the style in which the hyper dysfunctional modern era US Government passes new laws.
They do it almost strictly as a bundling system to guarantee no laws are ever vetoed. Which is how they've managed to pass tens of thousands of new federal laws, with a mere 79 vetoes spanning a quarter century.
The president was granted line-item veto by congress in the late 90s, when Clinton was in office. It got challenged in court and ruled unconstitutional.
Seeing these stats broken out as a percentage of legislation that crosses his desk would be much more interesting.