I'm sure many games surpass other games of the same genre in the same generation all the time (quality-wise) The impact of certain games in a generation, THAT is difficult to surpass. In the case of Halo 3 coming from an already well-established franchise, it practically SOLD the X360 for a whole year(Gears 1 helped a lot, but Halo3 was king of XLive). That's an impact I doubt any other game not named "Wii Sports" (which is THE king of impact) has this generation. Killzone 2 could arguably have surpassed Halo 3 as a FPS (gameplay-wise) as I'm sure Nintendo or someone else could surpass Wii Sports in terms of quality, but the impact, more importantly than sales, would be very difficult (if possible) to match.
In my humble opinion, there's still not a game on the PS3 that has had such an impact for it as Wii Sports or Halo 3 had for their respective consoles. Resistance 1 didn't make it, and Killzone 2 certainly won't. Metal Gear Solid 4 (sadly perhaps, but understandable) didn't. The impact of GTA4 was diminished and wasted since it went multiplatform, same with Call of Duty 4 (although this one could be the third major impact this gen, in spite of being multiplatform).







