If they had a more reliable striker they'd be way in front of Milan. They just can't rely on Matri/Borriello/Del Piero/Quagliarella to score enough goals. Quite an achievement to stay undefeated up until this point in the season though. Buffon and Chiellini have been huge for them this season, as usual.
I'm not a huge follower of the Serie A but I don't think anyone expected them to be challenging for the title at this point in the campaign in August. Fantastic season for them I think regardless of their final position if they can go unbeaten for the remainder.