The way I see it:
Pro:
Has given Bohemia Interactive more publicity than what they'd normally be receiving.
Has increased interest in this game and brought players who normally would have never tried it
Con:
It's caused a rift in the community with proponents on both sides of the argument acting elitist and hostile towards one another. And if anything it's changed a lot of the dynamics that shape player interactions in ARMA2. Older players often act rudely and downright nasty towards new-comers and refuse to help answer inquiries brought up by newer players and persecute them if they make a mistake. I've seen a guy literally run out of a game because he asked how to unload his backpack. They aren't as helpful or upbringing as they used to be. The tolerance is gone. (that's just a con as I see it: not a discussion)