Some may have, but I wouldn't. Halo 3's gameplay was so tiring it needed a big change-up. Gameplay felt so slow (playing BFBC2 and going to Halo 3) and the weapons needed changed. The Battle Rifle was the primary piece that can do all, and it's obvious Bungie wanted to remove itself from that, and I agree it needed to be, as well.
We'll see some changes within the weapons, grenades, melee, and other sorts I'm sure, but I can see myself having nostalgia moments like I did often in Halo 2 with it. Give the community the proper playlists and maps, and it will be guaranteed gold.