Rondo is a mercurial player under great pressure and scrutiny. He's also young still, just entering his prime. These games don't make me look at the bad ones and despair, they make me look at the future with hope.
I don't think Rondo can 'turn it on and off', I think he either is or he isn't on or off. And, as he gets older, he seems to have more 'on' games each year. In a year, two, let's see how many off games he has.