We love the food at the Biergarten - esp. the desserts. It's DF's favorite place, so we go every trip.
As for sharing a table - it can be as much fun as you make it. We usually chat a little bit with the other people at the table. It's always fun finding out where people are from, where they've been at WDW so far, etc.
One time, we shared a table with a group of women that used WDW as a place for them to get together since they were from all over, although they were all originally from Canada. They were telling us stories about other Girls' Night Out get-togethers, and they were absolutely hilarious. It was the most fun we had on the trip - which is saying a lot!