Super multiplayer co-op Game addictive

I summarize in my recession succinctly all important points.

Story: Here it does not really exist. Man running through Berlin and its subsoil and has rows kill zombie hordes.

Graphics: Not Burner but tolerable. For seeeehr short loading times and no shocks etc.

Gameplay: Easy to understand and clearly.

Singleplayer / Multiplayer: In my experience (10 hours of play), I find that the game in co-op mode is much more fun than alone. Colleagues can revive etc.

My conclusion: After about 10 hours playing time has made me the game addictive. With my group (usually four) makes the game so fun. Even levels that you have already played, still make capricious.

Fun factor very high, so 5 *