We split into four teams, with one providing power, one providing ammo, one building defenses, and the rest just running around trying to help out where we needed it the most.
There was a ton of potential. I had to keep adjusting the difficulty as the match went on to keep us alive and then to finish us off when we were running out of time.
I'd love a multiplayer coop game like this but with the potential to have fifty or a hundred players. Right now the office plays CS:GO once a week, with the settings changed to allow max players, but it still caps at thirty. CS:GO is hard for new employees to get in to so I'd love something where everyone has fun. We also did TF2 for a while, which was better because the newbies could be medics and still feel like they were contributing, but the hard-core player base loved the challenge of CS:GO.