Nuketown imo has been overdone in zombies already but Town was a great survival map with a nice atmosphere that fits Paradox Junction's theme
The map could've had the Nuke in the background symbolizing the missile from Moon that destroyed the earth and you could go back in time to a pre-destruction Town just like you can in Paradox Junction too.
They could've added more areas like the church or the bowling alley, maybe implement the bus depot as a new location