A brilliant co-operative first person hack and slash, akin to the Left 4 Dead series, with a darker grittier fantasy setting within the Warhammer universe.
As with most co-op games, it is more fun with friends, however with semi-competent AI, playing by yourself holds up just as well, and can offer a greater challenge if you seek it.
It features an enjoyable and somewhat in-depth crafting and leveling system among the main characters, and their multiple subclasses (careers), and the variety of weapons they can use to swat down hordes of rats, chaos-warped humans, and the half-animal Beastmen.
With it's multiple gamemodes, difficulty settings and AI director allowing for a different surprise each run, as well as new careers being released over time, the game has an immense level of replayability.