Tempting DeepSix...I'll have to think on it. The most daunting thing about the campaign game in WITP is it's epic length. At one day turns about 1600 plus turns. I played against the AI once (poor opponent) and even though I achieved victory over Japan in 1943 it still took a good five months of game-playing every day. It's such a strategic mis-match too. Japan is pretty much buried under an Allied avalanche by mid-game. Fun to try tho.
However, it might be a nice way to pass the time until SH4 comes out.