I also nominate Biergarten. -Especially- if you have a child or a picky eater! The atmosphere and entertainment are alot of fun (I loved watching the dance party they had in front of the stage every so often...very cute!). The restaurant is a buffet, with -lots- to choose from, from the very authentic German (saurkraut, schnitzle, schpatzle, saurbraghten, etc) to more 'north american' food (pasta, salads, etc). Their desserts were also very very yummy!
Also, for a large group, the wait to get in might not be so long. Being large 'beer garden/tent' style seating (IE: long tables with benches/chairs on either side) that seat 8 or 10, you would likely be paired with another couple as well. I remember when my family of 4 ate there, we were paired with another family of four. Made for great dinner conversation and new (short lived, admittedly!) friends!