but remember, GoW had 5 or so people on screen at a time in small corridor like environments and no vehicles. Halo 3 has 50-60 things on screen at times with lots of vehicles and huge out door levels. Im gettign so fed up of explaining this to people, it should be common sense.
You're forgetting that people in general are stupid. Think of how low the average intelligence is... well half of the population is BELOW that level.