Man, that pre-knee injury Vidal was something. In his first season here he wasn't too much involved in attack (7 goals and 3 assists weren't an awful record, though) but he was a defensive monster. Serie A's top tackler by far (5,4 tackles per match) who allowed Pirlo and Marchisio to shine.
Then, once given more room to go forward, he exploded in the following two seasons. In 2012/13 he was both Juve's top scorer and top assister, which is something only Del Piero and Tevez managed to do for Juve in the last 20 years. At the same time, he remained our top tackler (4,9 tackles per match) and serie A's second best tackler that season. If there ever was a complete midfielder, that was Vidal in 2012-13.
In 2013/14 his numbers were excellent again. 18 goals, but only 5 assists. Only Tevez with 29g+a was better. Once again he was Juve's and serie A's top tackler (4,1 tackles per match). If not for that knee injury later in the season, his numbers would have been even better. So, this season, like the previous one, once again showed how complete this guy is.
Then last year the consequences of that injury became more obvious. His numbers were much worse. "Only" 8 goals and 4 assists, and, maybe even more important, he wasn't the defensive king in midfield (probably due to the more advanced given to him by Allegri), falling to 6th place in serie A with only 3,1 tackles per match. By the end of the season he reminded of his pre-injury self, so Bayern could hope to get that beast from 2012-2014. We, on the other hand, can hope that we did the right thing and Vidal will never be the monster from the 2nd and 3rd season in Juventus.
Anyway, his 2012/13 and 2013/14 seasons deserve a special place in Juve fans memory. He was like 2 players in one body. A tackling monster who scored and assisted for fun. I'm struggling to think of another midfielder who did these things. Perhaps Gerrard in the mid 2000's.