I very much enjoyed World at War's multiplayer. I got a lot of hours out of that. And it had the original zombies, back when they were mysterious and scary, without all of the uber weapons. Single player was decent, but nothing special.
One and certainly two had awesome single player. Two is one of the best games in the genre I believe. I think if something like a Two or World at War came out today it would light it up. Instead we have stupid inaccurate WW2 and soon BFV. I think there are a ton of guys who grew up on MoH and CoD that would love nothing more than a basic-ish historically accurate game. Instead we have all of these different skins (weapons and characters) and unrealistic weapon upgrades to appease those who can't play without their red dot.
I think there is a game for these people that are willing to spend their money, being well into their careers now. Could be a cash cow waiting to happen. Instead we have have EA telling us not to buy BFV. OK.