This game is awesome! It has tanks in multiplayer! And when your ally is driving a tank, you can hop on the machine gun! It's amazing! ...super late to this party...
A warning to anyone who may read this and is thinking about buying WaW on Steam: I found out in chat in-game that treyarch messed up the game the last time they patched it on Steam so anyone who buys it on Steam now can't make a profile for multiplayer. Apparently this happened quite a while back and still hasn't been fixed yet. So, if you want to buy it, buy the retail DVD version and manually update it to version 1.7.
However, if you get the patches from the WaW page on pcgamingwiki.com, you'll find that the downloads for the first few patches and the last one work fine but some of the patch downloads in the middle (v1.4 - v1.5 and v1.5 - v1.6) require special permission(however this msg doesn't show up until AFTER it's finished downloading and then promptly blocks and kills it, like wtf!) So you'll have to find them elsewhere. I got those two patches from moddb.com but their kinda buried several pages deep in the WaW files tab. This site has them all(except v1.7?) and I saw it recommended elsewhere afterwards:
http://www.callofdutyview.net/downloads/Also the DVD version uses SafeDisc DRM for the Singleplayer/Co-op/Zombies executable and SafeDisc DRM doesn't work on Win 10( I kept getting "insert the CD" msgs when attempting to play single player even when my disc was in the drive. Tried mounting the .iso I made previously to install the game and same "insert CD" msg), so you'll have to find a no cd/dvd CoDWaW.exe just to play the campaign on Win 10. The multiplayer executable doesn't have any DRM and doesn't even require the DVD in the drive, apparently, so that's nice.
Anyway, people around here probably already have this game so maybe all that info isn't terribly useful. Just thought I'd share my experience getting WaW up and running today.