Page 8, seriously? *fistbumping* this thread of awesomeness with my own story.
First, great topic, OP! Do not see enough teamwork in this co-op multiplayer!
Had a blast the other night in a bronze room. First off, yes, I know, bronze. I am not a terribly good player and after a long day at a job that sucks the soul out of me, I just want to relax, have a beer, and kill some bad guys without stressing. So, I'm a bronze-for-lifer. And I am okay with that. I mainly try to focus on helping the new folks when I can. My main characters are support guys anyway: Turian Sentinel, Krogan Soldier, and Geth Engineer.

So, bronze room. I'm rolling my Krogan Soldier and end up with a Turian Soldier, a Drell Adept, and a Drell Vanguard on Firebase Ghost. Immediately, the two Drell brothers run off and basically contain one side of the map by themselves. Turian goes off to that side alley on the right and I join him to help.
After a few waves, the Turian starts going down occasionally. I rez him. I also warn him when we've got folks sneaking up behind us. Not too long after, we had this cool camaraderie thing going where we had each others' backs, one deactivating a device and the other keeping watch, etc... and after each wave, my fellow soldier would heavy melee at me as the Turian equivalent of a high five, so I started Krogan headbutting him back. We kept this up after every wave, even though he didn't have a mic and couldn't communicate back with me other than character movements.
Was awesome.
*brofist to all team players*