I have to agree that Thiago was poor today, and I feel poor for a fair few games. His tackles aren't very good, he gets pressed often and unusually this year he faulters a lot, and he isn't great at stopping counters. It's also a coin flip as to whether he is going to start an attack in transition or going to slow it down to a crawl with slow ponderous passes around with no penetration.
He would work well in a team playing neat passing football ala City, or would do well with strong athletic direct players around him to both cover him and provide an effective outlet, but as it stands he doesn't suit the midfield.
Now at least with that one, it is largely mismatch issue rather a skill issue. He is currently a luxury in a midfield that doesn't work, but he could be a good player in a functioning one (although maybe after this season I feel he should be mor a squad player). Henderson and Fabinho on the other hand just don't have the legs at the moment for midfield.