I picked it up on the Games on Demand section, strictly because it isn't a kids game and it's an easy 1000.
I only managed to do about 7 missions thus far... strictly WWI & Civil War. My gripes with the game are -- I have no idea what i'm doing. All the enemies look the same from your AI teammates... in the last Civil War mission I did, I got tired of sitting there with the constant respawning enemies, so I just ran from checkpoint to checkpoint.
It has some redeeming aspects.. but.. they get outweighed by the crappy gameplay.