For me my main points of contention are
1. Upgrades should be purely cosmetic, anything that is game changing in anyway should be available to everyone from the start.
2. Infinity slayer, if not completely removed it should be relegated to a lesser playlist. Power weapons and power ups should be placed at specific spots around the map like always, not rewarded for a couple kills at random like some stupid cod killstreak. It was a fun gametype for a bit, but not Halo at it's core.
I also wouldn't mind a classic halo playlist with no armor abilities either. What would bring you back?
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I actually enjoyed Halo 4, wasn't my favorite Halo, but I still liked it. I will definitely be getting the next Halo game