You should only play this game with other people, as to not risk suicide.
Basically the games physics go along with your characters appearances. You look like GI Joe's in short. And while that might be entertaining in another sort of game, in this hybrid attempt, it just doesnt work. If they had added more realism and less arcade style gameplay, the game might be 10 times better, but that is only speculating that it would make up for all of the other shortcomings the game has. Such as a bland and predictable non-storyline, bad voice acting, and mid-level graphics. And while the game is large, it doesn't quit meet the requirements for me to feel like it's truely "immersive". I blow a hole in a building, and while its a pretty accurate representation of such, I shoot at a certain part of the wall, the whole appears in the general area I shot at, but I there isn't a single building you can enter, and whats cooler than blowing a whole in a wall, then hopping in and taking cover in it? Nothing. But unfortunately thats not an option.
At any rate, the multiplay, whether it be true online play, or just you and a friend playing Co-op or DM, its still twice as a good, and less boring. While the game is formidable in that aspect, I wouldn't purchase this game. Rent it, check out its multiplayer see just how addicted you are to it, then buy or don't buy accordingly. To me this is a passable title, not worth more than a week or so worth of regular play, if that.