1. For dinner, how often do they have a "show"? Is it continuous?
The show is about once an hour and they play for about 25-30 minutes
2. Since it is a buffet (I think that it is a buffet) does it interfere with others if you get up to get your food?
No it doesn't interfere with others as the restaurant is tiered and you wont be blocking anybodies view when you get up
3. Is it fun?
Yes, very much
4. Do kids like it?
YES! My 3 year old was on the dance floor dancing the chicken dance, she had a great time
5. Any reviews would be appreciated.
I think the food is excellent. And to make it even better the food is a lot less "greasy" then at most German restaurants. The first time we went my wife was a bit nervous because the several German restaurants by our home serve everything pretty greasy and very heavy. The biergarten manages to keep the food tasting pretty authentic while keeping it a bit lighter. Also with that said be aware it is a bit Americanized but no less than most German restaurants you'll find in America
Also you may have to sit with people you don't know. Some people don't mind this others HATE it. If you have 5-6 people in you're party you will most likely sit with just yourselves but any less and you'll probably sit with people (most tables hold 8 some hold 6)
6. Is there a big difference between lunch and dinner?
Can't answer this as I've never been there for lunch. One thing for me is that between several trips to the buffet and drinks I'm usually quite full when I'm done, even just the thought of going on rides afterward is out of the question. So if you are a light eater you can do lunch there but at that point you might as well eat at the German counter service.