I concur with that.
After the match I heard lots of praises of Brandt but thought the same that was quite inconsistent during it, a lot of misplaced passes but then some moments of quality that ultimately helped Dortmund to their win. EDIT: Can't get tired of watching that overhead scorpion pass though
Overall, his performances at Dortmund have been encourgaing but not the level that would make me really hopeful of him becoming world class and a hope for the German national team. He fits well into a team that wants to play quick passing football where misplaced passes are common and the goal is to try and be as incisive as possible. That would not work for a slower, more patient team like say Barcelona.
Would you trust Brandt to be part of the center midfield for Germany? I wouldn't put him ahead of people like Kimmich, Kroos and Gundogan right now. They provide plenty of quality on the ball but more importantly are more secure with it. For Dortmund, with the 3-2-2-3 they play with Brandt-Witsel as their midfielders, they really need to rely on heavy pressing and energetic full backs to stop them from being exposed defensively. Don't know if the same can be translated to Germany.
Germany did float with the 3-5-2 recently with Gnabry and Sane upfront but with varying success (brilliant 3-2 win at Holland but then the 4-2 loss at home). Then I think we settled with 4-2-3-1 and had some impressive performances late on.