To me, there are 3 very distinct eras of Zombies.
1.0 – W@W, BO1, BO2, AW
2.0 – BO3, IW, WW2, BO4
3.0 – CW, VG, MW3, BO6, BO7
Obviously each set apart by its creative leads and design philosophies. I personally find it hard to compare maps from different eras, as their goals and purposes are ao different from each other.
Why not celebrate all of 'em, post your top 4 maps from each era!