It was indeed a bad season, and a terrible one performance-wise. But if you've seen the 2009-10 season, then I believe you're forgetting many things about it. We actually ended that Serie A season with a negative goal difference. We started it with so much joy and expectations due to Diego's and Felipe Melo's arrival, and everything after the summer mercato was a disaster. Seventh in the league with 55 pts and a negative GD, eliminated in the CL groups, just to be humiliated by Fulham in EL. Early elimination by Inter in Coppa. Poulsen and Sissoko doing miracles in midfield. Old Del Piero, Trez, Salihamidzic and Camoranesi were more often injured than available. Old Cannavaro and Grosso didn't give a fuck anymore. Amauri had the clapping hands season. Bunch of mediocre players were getting a lot of playing time. In many ways 2009-10 was similar to this year, but in just as many ways it was way worse.
P.S: On top of this, Inter won the treble.