I, for one, liked it... as some of you said the whole point of the game is teamwork. Survivors stay together, share ammo and weapons and cover each angle...
If you get infected then you get to take it out on the teammates that didn't cover you! Oh and I like the "scariness"of some maps... creepy!
It easily gets boring, the maps are way too big, there is almost no communication between human teams, as it has been said it is like a scavenger hunt and it is. Boring, unbalanced, hard, unfriendly to noobs. I uninstalled it, bad game.