There are many great places to get beer in Madison, and unfortunately Next Door just doesn't compare.
The space itself is huge and really nice. We came on Sunday afternoon, and other than a few people at the bar, the place was pretty empty. We grabbed a table and ordered a tasting flight of 8 samplers. The beers were all extremely carbonated. Most of them were overwhelmingly hoppy. I like hoppy beers, but these were hoppy in an unpleasant way. Beers such as the red ale, which you would expect to be malty, were hoppy and very bitter.
We also ordered the ribs and corndog to snack on. The ribs were terrible. They seemed like a pack of frozen ribs that had been boiled and then slathered in sauce and served to us. They were soggy and rubbery with an off-tasting very sweet sauce. The corndog was okay.
This does seem like it would be a great place to come watch a football game (they've got several TVs by the bar) or just hang out with a group of friends, but the food and beer did not impress me.