Here's my idea for Halo 4's playlist set-up. Instead of choosing one playlist from among nearly 20 other playlists, there are only 5 playlists: Squad (4v4, 5v5)) , BTB, FFA, Firefight, and Action Sack. However, once you pick a playlist, a stylized checklist pops up with a sort of parameters for each sort of playlist. These parameters would essentially let the player pick and choose specifically what they want to play.
Lets say you want to play Team Objective. You'd select the Squad playlist and the checklist with about 5 options pops up. By default, "Slayer" and "Bomb/Flag Objective" are highlighted. First, we have to deselect the "Slayer" option to get the classic objective experience. Since you feel like expanding your horizons, you can highlight "Hill/Territory Objective" to allow for gametypes such as Territories and KotH to be searched for.
Bam, a lot less cluttered than Reach and allows for an experience catered specifically for each player.