I have not followed him on a regular basis, but from the games I have seen him he seems a bit of a pointless player.
He often looks great and elegant on the ball, but tends to fade away when games get tight. His energy level and end product seem to be lacking and I cannot really say what his best position is.
In some ways he is the complete opposite to Bruno (or players like Müller) who can look clumsy and sloppy, but is so effective and makes things happen each game.
Of course Thiago is not a bad footballer, but I am not really worried that he plays for Liverpool. This can of course change very fast now that I have written this