i think that the conflict series was the best but Full Spectrum Warrior is the most realistic
I have not played any of the six games you mentioned in the poll still I voted for one and that was conflict.
now you'd asked me if I had not played many of these games then how come I vote for one. well the answer is very simple. I searched Google for the names and by the details provided to me I thought conflict is the best of the six. Since the reason of my vote is not very strong year for the more chances that my opinion is wrong but still I would say that a thing that you like in your first vision is likely to be the best of all.