A game that you just have to have played himself, teamwork is required!
If anyone has time rumirrt alone man no chance because einzelnde Zombies can already be fatal.
The only drawbacks I can see only in the few and short missions, the small arsenal of weapons and that only from the difficulty "Expert" only really arises mood because it's really there for survival.
In the other levels of difficulty, there was never any quasi risky situation - at least in the demo and an experienced person shooter player!
Uncomplicated, teamwork-based zombie shoot-- pure fun! - But for how long?