It wasn't the best performance in 'football history' - but I don't quite know why some seem so keen to downplay Germany's performance. Yes, Brazil were terrible, but that does not take away from Germany's sheer efficiency in the final third - as another FM stated Germany rarely made unforced errors - indeed, during that crazy period after Klose's goal Germany made 16 successful passes; only one pass did not lead to a goal. And as for the Algeria and Ghana matches; Germany were set up quite differently in those matches to the way they have been since the France game.
Against Algeria and Ghana, Lahm was played as a DM with Schweinsteiger, Metresacker was played at CB, Gotze started, and Muller was played up front - Boateng was also played at RB. Germany's issues there, was that Metresacker's slow pace could not handle the physicality of Ghana (nor the fast pace of Algeria), Gotze was dire, Lahm somewhat struggled in the DM role - with several misplaced passes, and in the Algeria game Hummels, one of Germany's most important players (tbh as vital as Neuer and Muller) was not present - instead the underwhelming Mustafi played.
Germany since the Algeria game have become far more balanced with Lahm returning to RB, Boateng and Hummels paired together at CB, Schweinsteiger and Khedira starting together, and Klose upfront. They've also used Schurrle excellently as an impact sub, adding much needed pace to Germany's game in the second half of matches.
The final, I'd imagine will be pretty close - the 7-1 is a fluke result. But one thing I'd say about Argentina is that throughout the tournament the majority of sides they've faced are sides who are poor in the final third - Iran, Belgium, Switzerland all come to mind. Indeed when they faced side who were decent in the final third - Nigeria - they weren't so defensively compact. Still, they did well against Holland whose attack is their biggest strength - although that was a very cagey affair.
If Argentina do win, I imagine it'll be a ground out 1-0 or something like that. Germany do seem to be the favourites, and they do look good, but anything can happen in football.