GRFS is more fun and addIcted FPS for me because you don't just shoot people like in crysis 2 In GRFS you should use some strategy to attack or planting a bomb on your enemy territory, i'd go for GHOST RECON FUTURE SOLDIER :) check also battlefield 3.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.