I'm, however, not bashing the game for the sake of bashing it. I fell in love with OFP: CWC. I felt like the Arma series kept adding on new things without ever fixing the problems that plagued OFP: CWC.
of the series i actually found ( i say found cos my decent pc is out of action right now) myself playing arma 1 coop the most, even when i had the sequel, because it felt like cwc only with better textures.
Some ppl objected to this lack of progress but i liked the familiarity, i guess it was out of nostalgia, and i also found myself getting very attached to the island.
Arma 2 to be fair was a decent step forward from it's predecessors i think - particularly with more realistic environment and buildings - and i acknowledge it as the best version that's great for organized coop.
However the casual nature of the evolution missions with ace on arma 1, where you could drop in and out of the campaign as you wished, from lone wolf to part of a huge logi effort, were some of the best times I've had in the series.