I was genuinely curious. I know fuck all about soccer.
Soccer coaches/managers, like all other coaches/managers/executives, have little impact. Statistically, you have basically 80% that will all roughly perform the same, then the top 10% who will over perform and the bottom 10% (aka Vinny Del Negro) who will hurt the team.
International coaches have even less impact than ur average coach, because they only see their players for about five weeks a year (maybe 11 during a WC year). The impact you can have on a player's ability when you see them for 30 days, spread out over an entire year, is basically non existent.
Ultimately an international coach's ability is based around two things - selection of players and tactical acumen.
You have to give some credit to JK for convincing Brooks, Fabian Johnson, and AJ, among other dual international, to play for us. FabJo is a staple and while Brooks wasn't great this week, he's arguably our best player and certainly has the highest upside sans Pulisic.
However, his traditional camp selections are highly questionable. He's shown a habit on calling up older players who even at their peak weren't international quality (Wondo, Orozco), too slow to remove players who have been staples of the team but aren't getting it done anymore (Beckerman), while completely ignoring players in the Championship who may contribute (Lichaj, Danny Williams, now Yedlin).
He also may be one of the most clueless tactical managers I've seen. The international game tends to be more defensive, since you don't have the time to work on intricate patterns of play or establish the reading of each other to have fantastic build up play. That's why Del Bosque was one of the best - he had this extremely technical group of players, always the better footballers, but it didn't work in the international game because they didn't have the prep time that Barcelona does. So he stayed defensive and utilized that great technical ability to control the game and have 75% possession and 3 shots haha
Jurgen is seemingly completely unaware of the talents of our teams. He opens us up too much and seemingly refuses to work on set pieces.
His legacy was always going to be the foundation he's put in place for youth development. At some point the future - maybe in 2 summers, maybe in 22 summers - we will reach the semi's of a WC and it will be traced back to him. I've been a big defender of his because he's done so much in that aspect that I get the opportunity to see on a daily basis.
However, his legacy may also be as the most underachieving manager in 30+ years.