The department I work with at my employer has 10 people. We recently went on an offsite trip and did some casual team building activities. I brought my A2A (including expansion packs 1 and 2) and we ended up all playing for nearly two hours of laughter and camaradarie.

I wasn't sure if we could play with that many people, but I think it helped that we were already familiar with each other to at least some degree (some much more than others), and just about everyone really got into the competitiveness, despite the subjectiveness of the game.

Anyone else experience a successful play of A2A with a large group?