I think this zombie version is pretty good, looks exciting and fun. If it compares to COD World at War's zombie map pack, I think Island of Dr.Ned might have more different way to have fun and play !
It's wierd how they throw in this content for mid-levels but do absolutely nothing for players who have progressed to the end of the game (unless you play the campaign over again).
...yes yes its like left 4 dead. except for the fact that its nothing like left 4 dead and the only thing remotely close is that it has 4 player co-op and they released this zombie DLC.