Can you be more specific? What did you love about Halo 2 as compared to 3? For me, personally, I despised Halo 3 due to the lack of hitscan. Too many times I felt cheated out of a headshot. I'd then go watch the replay and see the bullet travel through the person's head only for it to register as a miss. But since Halo 3 both Reach and Halo 4 were brought back to hitscan so I was happy.