If you have that as your frame of reference his season looks quite good. If you forget that he is the highest paid player it is really not that bad.
Zito started off 2010 strong with some good pitching and even better luck. As the months past his luck came back to normal and he didn't quite have the same success. He posted an ERA of 1.53 in April and then couldn't get anything close to that again.
Zito was a serviceable enough player this season and seems to have recovered from the black hole of suck that was his first couple seasons with the Giants.
Let's all cross our fingers that he continues to be the best fifth starter in baseball.
If your on Twitter you should definitely follow the The Crazy Crabbers. If you're not you should really consider joining, lots of good stuff going on there.