A bit of a tourist trap given the location, but not to be missed.
We went around Christmas time, so can't comment on the beer garden, but the hall/restaurant itself is lovely. Reminiscent of something from a Saxon or Tudor era film, the hall is all wooden beams, coats of arms and antlers. Dim lighting and candles on the long tables add to the atmosphere.
Seating compromises of booths, and long tables, which is good if you're into meeting new people.
The food is restaurant standard rather than pub grub. YOU DO NOT NEED A STARTER! The main courses and litres of beer are more than filling enough.
My partner had steak, and I had duck, both which came with ample sides. We found it a bit odd the waiter didn't ask how we wanted the steak, but it was cooked to perfection.
Our waiter was very friendly, and explained to us the brewing process for the Augustiner beer. At the end of the meal, he gave us a souvenier from our meal, which we were told to smuggle out of the restaurant. I'm not sure if we really needed to smuggle it out, but its the sort of thing you find amusing after a few beers.
We'll definitely go back again, hopefully in the summer to try the beer garden.