This game wasn't worth the money.
Zombies has a setting and enemies that are similar to Doom which is cool I guess but I wanted to play zombies not Doom.The portal aspect is repetitious and boring after 30 minutes of playing and perks/upgrading guns are both underwhelming compared to Cold War.
Campaign was fun and had a decent story up until the end. I fought my way through the hanger to kill what I assumed was the first boss of at least 3. Turns out it was the only boss in the game. The game abruptly ends because you apparently stop an operation that was supposed to do something that wasn't explained.
I didn't even bother with multi-player after playing both of the other modes. It felt pointless. Way to ruin a game Sledgehammer.