A bit shaky the first game, the next it looked like he has played here for five years. I guess if you're the vice captain at your old team, a team that defends differently, and you come to a new club it might not be perfectly intuitive immideately, but man he clicked quickly didn't he?? I expected it to take longer. Sure there are more tests to come but still.
And yes I agree, for me a German world champion squad player combined with his age in his position warrants a big portion of the the £35m fee almost as a blind purchase. I expect him to eventually show some weakness, he is only human after all, but he has raised my expectations by gelling so quickly (read: after that stellar performance vs. Chelsea). He will be tested further I'm sure!