The issue with Liverpool under Klopp is that they play swashbuckling yet brainless football. When it comes off against the likes of Arsenal, it looks great and the football world gets blown away by how exciting and attack minded they are.
But when intelligence and a bit of tactical nous is required, like against Sevilla or City when they're reduced to 10 men, Klopp hasn't got a Scooby Doo. He's clueless in this regard and keeps making the same errors over and over again.
He's a decent coach but will never be top tier like Mourinho, Pep and Ancelotti.