I think he was in way over his head acting as both Coach and Technical Director.
As the TD, I think he did a fine job. The development, and placement, of top end youth players from the US has been unprecedented during his time.
The issue with Klinsmann, is much the same as with Brendan Rodgers: as Phil Lahm pointed out, he's a fitness coach with no real technical prowess, and no system to implement. A constant juggling of formations and rosters, and never seemed to have a game plan of any sort. He also had very public rifts with his top superstars, leading to teams with very little in the way of top end leadership on the pitch.
Unfortunately for Klinsmann, this move came 8 months to a year too late.