1) Jurgen Klopp

Jurgen Klopp kept Coutinho this summer, but it is only delaying the inevitable and denying Liverpool funds to spend in an area they need a huge improvement, at centre back.
The likes of Antonio Conte, Jose Mourinho and Pep Guardiola would have sold the player and enhanced the area the team is struggling in, showing the difference between Klopp and those top managers.
Central defence is a position he has now failed to improve for 2 years, and it is hindering Liverpool's chances of challenging for trophies, with his expansive style meaning they concede lots of goals.
In his first season, Liverpool conceded 50 goals, the second most in the top eight of the Premier League. And his team then conceded 42 once again in the next season, the second most in the top six.
Also read: 5 reasons why Jurgen Klopp will never win the Premier League with Liverpool
His time at Dortmund was more successful, winning the Bundesliga title twice. However, they did finish in seventh in his final season, a dramatic fall from his otherwise successful tenure.
Currently, though, Klopp's Liverpool team continue to drop points against teams lower in the league table due to his negligence of the defensive issues at the club, playing either Dejan Lovren or Ragnor Klavan regularly, two players who have been appalling throughout their time at Liverpool.
Klopp is arguably the most overhyped manager in football at the moment.