Excellent game, hours upon hours of content, quick to receive code.
This game has almost too much content, its the most expansive COD game so far. Everytime I load it up I'm not sure what gamemode I want to play first. My last game was Black ops 2, I had quickly given up on COD after there were no real zombies to keep me going and the multiplayer seemed stale. This time Treyarch have spent over three years on development and it shows; Zombies, an expansive co-op campaign, new ways to play multiplayer, free run mode and even more zombies, what more could you want?
If you are thinking about getting it, it is absolutely worth it for the price on cdkeys (£25 at launch) for the amount of game time in relation to price, I almost feel like I've robbed Cdkeys. They sent me the code within 5 minutes of buying, so my last minute purchase on the night before launch, meant I had enough time to download it to join everyone else at midnight.
Get this game, you won't regret it.