Just went for the first time last trip. As a couple, we were seated with another couple and a family of four. The family of four was late, so us and the other couple were seated first - and we chatted along nicely during the meal. The table of four that came late was in their own world.
We liked the little show. It's not awesome or anything, but it was a nice added-feature to the event. And few kids really got into the polka.
Food - buffet had lots of choices - but not that many that were "super authentic" German food. A bit Americanized. Different selections though, for sure. So if you are looking for "a different buffet with some German food - I'd definitely go. Food was overall good, a few dishes great, a few dishes not as good as I might hope. Nothing was bad. All seats are good for the show, but some tables are closer together than others - and that can make it feel cramped. We were on top of the table next to us on one side and folks couldn't get out to go to the buffet without everyone moving. That was annoying.
It's a pretty good experience - especially if you price compare to other options. We'd do it again - but maybe not every time we go.
My significant other really appreciated the shared table experience (our conversation with the other couple was really nice), the show, and the fact the food is a bit different than many typical Disney offerings. That made it unique enough to be a big hit for him. Me, I'm pickier about what is GOOD German food and had to keep getting up due to the tables being too close together.....