He's a great manager (I think he should be managing a bigger club like Real Madrid, there were rumours of him going to Spain when he left Dortmund) and he's had a decent run in the premier league since 2015.

There's no doubt that the guy is more than a capable manager, especially if you look back when he was in germany. With Dortmund he won 2 league cups, 2 league titles (in a row), and 3 supercups, he was able to compete head to head with one of the biggest clubs in the world, Bayern Munich.

Obviously, when he arrived at Merseyside, expectations were extremely high (as they should) because, if he accomplished so much with Dortmund, imagine what he can do in a 5 times champions league winner club like Liverpool. So far, he hasn't won anything with the club, so yeah, domestically he's been a flop (I say domestically because Klopp managed to guide Liverpool to the first european final since 2007 CL final), but I'm sure the fans and the directive board are happy with Klopp right now.