Obviously the lack of split screen happens because they are pushing the hardware already to the max, split screen would be probably impossible with this graphic quality. I'm sure someone has already mentioned it but better to be sure. :P
And yes, it is "aliens from outer space invade the earth" redone for the 111 millionth time, but it has some weird looking ball thing and fun organic weapons, that is enough for me to try it. I love FPS, but they've became basically the same game over the years, so any change no matter how dumb is actually welcomed.