Klopp won titles and got to champions league finals.
Tuchel's record at Dortmund:
2015/16 - Bundesliga: 2nd / Cup: Runners-up / Europa: Quarter-Finals
+ improved Aubameyang as a striker
+ bought Julian Weigl - an outstanding young player who he identified as key to Dortmund challenging again
+ went on an 11-game winning streak
+ introduced youth players to the side regularly
- didn't sort out their defence
2016/17 - Bundesliga: 3rd (struggled at start but they came strong again. Leipzig shocked everybody with a great start) / Cup: Won / CL - qf's
+ Aubameyang won the Golden Boot - has lauded Tuchel as a huge part of this
+ Some really good attacking football
- defence still leaky - not helped by Hummels' departure
He's a good manager.
Not world class or anything, and there's clearly no guarantee he'd transition to the Prem, but a very good manager nevertheless.
However, i'm glad first and foremost that Unsworth is going to be given a chance.