I think you guys will like the game.
It seems like a 3rd person, slower paced Left 4 Dead to me, but still very frantic and intense. I only played a single round of Offline Practice, and with that I noticed a couple little problems.
Each class has their own special perk, like distributing ammo or creating a healing area. The only problem is, I can't see any gauge or number saying how many of those you have left. So in the first half of the level, I used up all the ammo cases, and had to just hope there was ammo lying around somewhere. Also, the objectives don't seem clear enough to me, I missed a major objective where you have to "download data" from a computer, and got all the way to the end of the level, only to not complete the mission. I couldn't go back, since I was out of ammo, so I was screwed.
It's still tons of fun though, you guys will enjoy it, no doubt.