I actually thought Chiellini (along with Bonucci and Barzagli) had a fantastic game up until the Suarez bite incident.
In fact, the 3 Juve CBs had the Uruguayan attack in their pocket for pretty much the entire game (they had one chance after they went down to 10 men) Suarez, being the cunning, cheating, dirty and disgusting rat that he is, knew he had to do something in the final 10 mins of the game to turn the tide in Uruguays favour. Premeditated, blatant and disgusting cheating and it worked. It knocked the Italian defence into all sorts, ruined their concentration, and in the corner kick they had a few ins after the incident, they score.
Uruguay used their street smarts and succeeded. I just hope FIFA clamp down on that disgusting pile of filth and ban him for a minimum of 10 games. We all know they won't though.