I think of a very goal productive match, because Real Madrid are strong in attacking and Manchester City lately have big problems with their midfield and defense areas. A big defeat with Arsenal is an example on how weak and vulnerable Manchester City defense system is.
As you said, the defense line is so fragile and there is no effort to stop the attacks made by Jude, Vini and Mabppe. There is no strength that can be shown by Manchester City in this match, they must admit that their opponents have greater quality than them this season.
I can't imagine what their fate will be when the second leg later, of course Real Madrid is so strong at home and this is a bad thing with the defeat experienced by Manchester City in this match.
My assumption is that if Real Madrid advances to the last 16 of course no one will be able to stop their progress again, Real Madrid squad is very strong, even Brahim Diaz managed to show his skill in this match, I was so amazed by his appearance.