This game is very excellent, and well, the story is great and the game has very good graphics. The graphics, the story, and the way you can watch Marines fight other bad guys like gigantic aliens. If you're low on health you can just watch all the action and kill any leftovers. I think the graphics are better then Dreamcast on this game. Probably the controls because you have to use the keyboard, and there are like thirteen different buttons to push, and if it's your first time it can get pretty hectic.
Some parts are extremely hard.
No, there wasn't very good help from the book. I just played it and learned as I went because it is pretty easy at the beginning. They just tell you what to do, so you'll get it as you go on. You really get into it, and it can get scary because you can watch as good guys get killed by bad guys. Oh my god, the graphics were the best I have ever saw.