Emblems don’t show up: That is just lazy. Give us the option to make our emblems for each game so they show up in game.
Co-op Matchmaking: Half the game is unplayable without this. Are you guys kidding me? Halo: Reach had this so there is absolutely no excuse!
Custom Games Matchmaking: I have wanting this since Halo 2, wtf guys.
Forge Matchmaking: Same as above. Basic issue. Just make it so only the host and whomever the host chooses can become Guilty Spark.
This is coming from playing the game for less than half an hour. Halo 5 was a massive disappointment because of the issues above as well as lack of armor abilities and content (namely the vehicles) 343 has truly killed the Halo franchise. Even the classic weapon and vehicle sounds are gone.