The main aim of signing Ronaldo for Juventus was clearly to win the Champions league, which they didn’t achieve. I see this as the main reason why people claim Ronaldo wasn’t a good signing for Juventus. As well as him being one of the main reasons for Juventus’ economic issues.
To be fair, you could have brought better players even with Ronaldo signing. I mean, Ramsey on a free? He was never going to win you UCLS.