Make it in infection you play as a flood/flood infected spartain instead of just a ugly colored spartain
No armor lock because even though they nerfed it is still stupid and plus most people made it
A playlist where there are certain ranks like Medic, bomb expert, team general to give us a cool playlist where you choose your class and there are one our two people can choose that class because when to many people pick the same class it can be a overkill but have a cool objetive like invasion
in the playlist idea above have killsteaks like place a grunt sqaud or elite squad to help fortify big areas but make them not to hard to kill they can kill you but they are mainly used for distrations( probably the worst Idea but its a cool thought)
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make it hard to rank up like in halo reach but use a diiferent exp system
Forge should play a big role again but be able to place more objects with a bigger budget or unlimited everything but you need the memory to store the map
Make a race playlist
thank you for your time tell 343 to suggest ideas from me and the community because making a good game is based on the communities liking