The backline of Chelsea consistent of a PSG oldie that they didn't want to keep, Christensen who nobody rated, and Rudiger who as well nobody thought highly of years ago. So... I don't know what people expect really. Oh, and City had Stones in it who looked exactly like Lenglet. Good on the ball and that's about it, easy to beat 1 vs 1.
The CL finalists showed that the defense is pretty poor on an individual level in most teams. Defensive organization is a manager's work. And don't even get me started with Bayern and Boateng. Boateng was so bad he was even folded by freaking Suarez
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That defense can be worked with. It consists of pretty young and fit players. From here on, the manager needs to do his fucking job and put these players on the field in a coherent way.