I haven't played ArmA1 or OFP. I just came across the game trailer on youtube.
The whole idea of this game, the realism, the graphics has got me so interested that i can't stop thinking about it.
I have never been so exited about a game since... ever :-)
I actually really dislike run and gun games where the missions are like - Kill all enemy soldiers - Progress to the next patch of land by following npc's - Kill all enemy soldiers and so on.
I want to explore stuff, get to know my enemy, use tactics, play like I am in real life, talk with the civilians, secure areas. I also want to know the backround of the group of people i am killing - Like the nationalists, know their cause, their most know areas etc..