Same level as before Cristiano departure, really?

I think Manchester United have been declining and they were not at similar quality level like years ago with Cristiano Ronaldo and even couple of seasons before his return to Manchester United. Cristiano wisely left the club as consequence of internal conflict but perhaps he saw no good future with Manchester United.

Years later, they played terrible and worse than seasons ago, which is unacceptable with an ambitious player like Cristiano Ronaldo. If he had not leave their club, he would have not contributed too much by becoming older and older year by year.