Our big green style, cannot be defeated!
-Sgt. A.J. Johnson - Halo 2 - Metropolis
Personally, I loved how even on Legendary, if you shot a hunter in the back with a pistol, it died instantly, I found that highly amusing when the game came out. More importantly, I like the way the Forerunner building & construct designs looked in Halo 2 & 3, because in Reach, they look different. They don't have those cool geometric symbols they used to.
Halo CE Remake: http://www.youtube.com/watch?v=NGyFq7LfOqs