Fei-Hung on 23 January 2010
because gow1 + gow2 were on a console which had more exclusives and more choice of games when the ps2 was at its peak. gow3 is being released where there are not as many games being released and on a console which has lost a lot of exclusives, thus the customers have less options on what games to buy.
the ps2 also had a lot of people who were on their 2nd maybe 3rd console. i went through 3 ps2's and i am sure i am not the only one.
possibly same reason why mgs3 snake eater sold less than mgs2 and mgs4.
