I can't be bothered to state all the features that should be removed in Halo 4 to make Halo 5's multiplayer more like classic oriented. Just make it an arena shooter.
I really want to see:
-A classic art style, not lol Halo 2. Halo 3 had the perfect blend of Halo 2's general design with the bright and solid and simple look of Halo CE. If we could make Halo 5 like that but with a less blinding Halo 4 lighting system, it could turn out pretty well. I want it to look more simple, not like a cluster (Halo 4).
-If the arbiter returns I would like the missions to always switch from the chief to the arbiter because I loved being the arbiter in Halo 2, it added more depth and meaning to the story imo. When the arbiter was in Halo 3...he was just there, you didn't really notice him and the bad ai he had made it even worse.
-The weapon models and sound effects need to be similar to past Halo games especially CEA because those ones were superb. The sound effects need to sound less like generic 80's movies and more like Halo whilst the weapon models should look like Halo 1 or 3 or CEA as they had the best weapon models (especially Halo 3) in my opinion (and art style, especially CEA and 3). CEA was really good, we should base it off that rather than Halo 4.
-Halo 4 had excellent music but in Halo 5 we should have a blend of new and returning music.
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No custom loadouts and a general design ethic that doesn't promote randomized gameplay; that's enough for me.