We find less and less activity about addons and multiplayer. Personaly I often play in Ofp I think it has a big capacity in the source engine (simplicity) compared to Arma and ArmAII but it is a old game today and his limits are achieved .This is the reason (i think) for which many leaves Ofp. There are no more creation today even this game is interesting for some people. I prefer Ofp more than his successor (I played the Arma II demo) but it's my opinion. I can't modding today (Windows seven) but i tryed to modding in my old config and it's difficult, congratulation for all scripters, addons makers and texturers for their works, I encourage the modders to continue :)
Ps: signal if you see a typing error xD ...