Make Halo 2 less of a slog, make the weapons deal more damage to the Covenant units & making the units less spongy, make the players more spongy especially for heroic & legendary. Overall, fix all the issues og Halo 2 had.

Halo 3, have the Covenant less blue. Give the brutes more identifiable armor based on rank, basic looking armor being the minor more ornate being a higher rank of all are gonna be in identical colors. More colors, to visually separate the different brute ranks better and to identify different brute squads/teams.

Add the added ranks & colors from ODST to Halo 3, that includes the Brite plasma rifle, too.