What i loved most in the recent multiplayer modes of the halo series was the swat playlist.
The games had a fast pace and it is easy to adapt to. The teams were often pretty balanced since aim was the winning factor. You get a one shot one kill when you shoot the enemy in the head and that leads to that a team that is 30 kills under pretty easly can regain the lead.
A cool addition to halo 4 is the choice between dmr and battle rifle.
I would love to see this playlist revisit the halo multiplayer one more time.
I also hope that they bring back the MLG playlist since it is a really competitive playlist.