Grief is the name of the game type. It's designed to do exactly what it says. Cell Block is cool because you can turn on acid traps or the fans that will down other players. The goal is to play as dirty as possible. Block doors, block hallways and let the zombies run into the other team to down them.
Or just set up in a spot as a team and try and out last the other team. Burough the new map has tons of space so usually it's just a last man standing type of scenario.