Because that's what the title of the game really should have been, since this game will be most remembered for the ridiculous number of map packs released by Treyarch involving undead axis hordes.

While I'm a fan of the action-packed, run and gun zombie shooter left 4 dead, I think that Nazi Zombies definitely has a more tactical feel to it (relatively...) due to the reduced magazine sizes and durability of the enemies. Seemed getting headshots is a hell of a lot more important in NZ as opposed to left 4 dead. Either way, I can say that I've spent more time playing that game mode with my friends compared to a lot of other recent games. COD5 isn't a great game, but nazi zombies makes up for most of it.

Anyone else with a similar opinion?

ya cod5 wasnt great onlyl for nazi zombies. i was waiting for COD MW2
l4d got pretty boring real quick
Killing floor is way better than any of these games for theres so much more teamwork

Yeah actually waaay before left 4 dead came out I was playing killing floor too! Back when it was a free ut2004 mod. Now you have to pay for it But I still have a good memory of it.

Nazi zombies was still hard even after using cheats. LoL