Yes it is. It only fails when he's not complimented by those around him. He did his bit in tracking two players, he gave those around him enough time to then close in on the United players, but they didn't and were made to look like chumps. He was our best midfielder against Palace and our most effective defensively, he tracked back everything and won the ball back for us a few times when Palace were looking to break. He's not the most physically dominating player, but he makes up for that in awareness and being quick to spot danger. It's not his fault that more experienced players around him are well off their game.
Put him in a midfield with a fit Fabinho and Thiago and he'll be perfect. And saying he lacks speed is utter fucking bollocks, he's quicker than Henderson, Thiago and Fabinho. "We watch the game you know". He's probably been our best midfielder this season, which is as much about his own qualities as it is about the failings of others.