It's pretty linear alright, and I'm still unsure if I should go get the game, cos after playing 5 hours on a guest account, the game goes on the borderline of tedious for me, much after how diablo 2 ended up for me. *No offence to Diablo fans out there*

Granted, it's an awesome playing hack n slash n projectile stuffs, but the 'zombiefied AI' as your competition, or lack of, leaves me going back into MOBA games like Dota / LoL.