"Alonso could have won the title twice for Ferrari - he did mess up in 2010 for his infamous grass pass on Kubica at Silverstone and 2012 - he simply hit a bad run of form just as Vettel hit his purple patch ."
I guess in 2010 his jumpstart in China, his crash during the free practice in Monaco, his crash in Belgium and the strategy error in Abu Dhabi didn't really help too. It seems he was pretty crappy back then.