Not sudden at all, it had nothing to do with yesterdays match. It's just my opinion based on his overall stay at Juve.
As for his yesterdays performance, I disagree. Then again, people say I'm biased when it comes to Marchisio, so I won't comment any further. Still, I'm glad I'm not the only who thinks that. Scroll a bit for ratings.
http://www.corriere.it/mondiali/2014/pagelle/
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Oh nevermind, other newspapers gave lower. It's people voting.