I thought Nadal played well at 2011 Wimbledon, for the most part, particularly the wins over Muller, del Potro and Murray. His best Wimbledon by far was 2008, and he was also very good from the fourth round onwards in 2010. He showed remarkable strength in 2007, in almost winning the tournament despite having to play every day in the second week.
He was poor at 2012 Wimbledon, and not just the Rosol match. The signs were there in his first round match against Bellucci.