This is about what i'm looking for. However I don't think halo can be compared to COD in terms of being fast. Due to the fact that you can kill someone in COD before they notice without having to have a shotgun or energy sword.
I do miss the speed from Halo 3 but there were a couple of aspects in Halo Reach that I liked. I am waiting to see how this new "quick" style of play works with assassinations.