No, I played in both games. In my opinion ARMA was better.
OF2 Dragon Rising on high resolution looks good but not epic.
Action is veeery slow. AI sucks, There was a guy in car and I raped him by knife but my team was trying to kill him from ~30m :o
Missions are boring, put C4 here, go here, put C4 here, take the point.
In ARMA you have more options. Also DR team control system sucks.
Btw. I think we can play together in DR