Ok, my 2 cents: Good, surprisingly good. Good graphics. The proximity alarm from the movie "Aliens" is a nice touch. Wish it were FPS instead of 3rd person. I do think having 3 live players with you will improve game play. The double pistols are nice weapons upgrade, and strangely do more damage than some of the rifles...
In other words, as a FREE game - this is amazingly good. I would say this game would be worth paying for. I have paid for less.