What makes Resistance good is the functions of the weapons and the scale of some of the battles. RFOM is not the best FPS around, but a really solid one (for consoles) especially given the lack of great software during the first 6 months or so on the PS3.
thekitchensink: Have you ever played Gears? it's 6.5hours at MOST the first time through if the difficulty is normal. If it's put on Co-op the game will go even faster.
Leo-J: you are out of your mind if you think RFOM is 16 hours long. 8-9 hours max.
Maybe you guys are just slow....