I felt a little disappointed it was too similar to left dead and yet if they made it different from left for dead I would have been disappointed too no win there. For with world war z and even left for dead, I knew the reason we were doing each level didn't feel a story as to why we were out fighting the zombies but it is a beta.
Weapons I mainly stuck with SMG, I did see a difference between normal rare and epic. You'd get better sights, silencer, more ammo capacity and general handed better. Was upgrading then at the store between levels and think that where we were lacking it getting the right equipment. Medic bag, Ammo bag, tool kit, stun gun etc.
With world war z you felt you were in an epic zombie battle with loads of zombies with back for blood zombies were a little too few and only felt in trouble when the special arrived on since but that's just for left dead truth be told.