If it is, what improvements would add to make the game type more fun in Halo 4. Is it a good idea to have invasion games longer? (Idea From Arcade Wizard)
More maps, different game types, like generator defense, and maybe make the objectives more detailed like a user interface you have to defend or having to plant explosives.
More available weapons you can pick up. Maybe a class for your character, with different armor types, like recon/scout, heavy weapons Spartan, Rifleman/standard infantry, combat engineer (explosives).