Biergarten is my family's one universal must-do restaurant in WDW. Everyone, from DS2 and DD5 to DW and I, absolutely love the food, entertainment, service and ambiance. The food itself is authentic and delicious, but what makes it even more food is the show and the service. Even being seated with other families is an enjoyable part of the experience.
Put another way, on our last trip we did CRT & Akershus, and while my princess-obsessed daughter loved both of them and pretty much every place we ate, the dinner that she really still talks about is dancing with the other kids at Biergarten!
While I don't know your family's personality, I say that you should definitely give Biergarten at least once!