Well, I loved OFP, ArmA and now ArmA 2, and I think that those are the best games ever next to LfS and Red Orchestra.
But then, you need a lot of patience to play it. Not only does it run sluggishly on most machines, it's quite buggy, and you really need to advance cautiously or you will die numerous deaths.
Also, multiplayer isn't really pick up and play, as you need lot's of communication and coordination to get the most out of it.