I went to this restaurant twice last time I was in Berlin.
This restaurant tends to be rather crowded, somewhat noisy, but it is a perfect place for a meal with a group of friends. Augustiner is more of a fun, casual venue than a place for a romantic dinner with a spouse.
This is the real thing: Very German, huge glasses of beer, honest no-frills food that will fill you up. Good selection of different dishes. Service is fast and very friendly. Reommended for a casual and fun, authentic German food experience.