I can tell you have thought about this and have plenty of quantitative analysis to support such a dumb statement
It's an exaggeration obviously but one just needs to be realistic to see he brought nothing new, he didn't improve the team at all to what we already had (same number of goals with and without him, same success with and without him and same for Napoli too).
He was out of shape and unprofessional most of the time. We made a huge investment and gave him a superstar salary, he played the most minutes he could've, every attack went through him one way or another, etc etc. If you can seriously stand there and tell me that he was a good and successful signing that's your prerogative. But this is not your average PL club who overpays everything that walks. That was Juventus and that transfer was something unheard of. That was 90m before Neymar and those other guys, before the market went crazy. I remember people's reaction around the internet when the rumors first started flying in, it was the biggest joke ever, no one believed for a second we would pay all that money in cash. 40m for any player was a laughing joke at the time.
And forget about the exact number. Just think of what it represents. Juventus paying that and any other club paying that is not the same. We put all our faith in him, all our marbles in one bowl. He had exactly TWO great games in Europe in two years. TWO. And again, it's not just about goals. Ronaldo scored just one goal in CL this year and he was amazing in every single one (except YB away). Mandžukić blew him out of the water. Tevez was otherworldly good in every game. Morata was decisive 70% of the time. Higuain wasn't just average or something, he was the worst player on the pitch 95% of the time. And it's not like everyone else was shit so he had an excuse.
So no, I'm not happy and grateful that he didn't do anything Matri and Quagliarella couldn't (in Serie A) and a year-away-from-retirement Carlos Tevez couldn't.
Fuck him and his stupid whiny 'you-don't-know-how-hard-it-is-haters' face. Good riddance.