I have BHD for the computer, it is a realistic game, based on the movie and the events that took place in Mogadishu (it has several mission leading up to the "Irene" mission, as depcited in the movie). The PS2 version is identical to what is on the computer, as far as mission layout, I doubt they will change much with the weaponry or the gameplay. I have to say Socom 2 is hands-down better than BHD, (I'm not trying to diminish BHD), but there is no comparison.
www.blackhawkdownthegame.com