This is the last world cup for nearly half the German squad.
They are playing poorly yet can still defend well. Up front, Gomez is over the hill and Reus is not the player he once was (indeed it could be said that he is an injury looking for a place to happen), whilst Werner is bang average. Muller is the key - If he continues to be relatively poor Germany will fail to convert draws into wins. Of course Germany win penalty shoot outs by defaul but it really isn't the German squad of 4 years ago.
Ozil in midfield as another example...