It's mostly just because we enjoy stealing everyone else's stuff.
Also yeah this game looked pretty shitty, WW1 isn't going be a good setting for any FPS, an RPG with perma-death would be my dream game for this setting, you'd actually experience some of the terror those guys went through.
You'd be surprised. There was a WW1 mod for BF1942 and it actually played out really well. With trench warfare and everything. I had my doubts but I played it for quite a while. Would love to see a proper effort to make a WW1 era game.
I remember trench warfare being very tactical in that game. Fighting up zigzagging trenches, crossing between open ground. It required a lot of bayonetting and grenades plus a very fast trigger finger when you ran round a corner of a trench and were faced with a bunch of enemies shooting across at your team mates.
Designed properly it could be great period to base a game especially with the early tanks, machine guns ect.