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.
No. He was not the only problem but they likely would have won the Serie A titles and ended up in a better position if they had been smarter in their transfers instead of recruiting the players that they did irl.