I think Gears 1 and Killzone 2 have very different reasons for sales...
First, I think Gears was the first true NextGen shooter... And it introduced us to some very nice FPS gameplay concepts... The Lancer saw, Active reloads, a new kind of cover system, great graphics (at the time), etc... Gears showed us what is possible this generation...
Killzone 2 is a totally different story. It is absolutely stunning to watch... But, gameplay wise, it hasn't really added much. Don't get me wrong.... Gameplay is solid and near perfect, but, in reality it is pretty average for a modern shooter...
Although I see some solid reasons to compare the two games. They are both good in very different ways and for different reasons.







