One playlist is not good enough. The idea of matchmaking preferences replacing playlists is not good. Here’s what we need as a new start point for playlists:
2v2 Slayer
4v4 Arena (King of the Hill/Oddball/Capture the Flag/Strongholds
4v4 Slayer
4v4 Attrition
4v4 Tactical Slayer
That is the bare minimum I expect from a Halo game’s ranked offering. The way its setup is nearly perfect, just need more than one playlist to play.