That's another reason why I think there should be ranked playlists with visible ranks. It makes it that much more important to stay in ranked games if something like a visible rank is at stake.
I play ranked playlists for either the competitive gametype or the rank. I play social playlists when I don't feel like trying to win. That was the distinction made in Halo 3 and I think that was one of the things H3 did rate. Those matchmaking hoppers were really effective.
The thing about visual ranks is that it ties everything in. If you want to play a ranked playlist, but don't actually care about the rank, then you'll be in the lower ranks with similar minded players. It's nothing against you as a player personally, it just sorts you out. Higher ranked players have played for that rank and care about winning, so they'll be matched up together.
Drop in drop out (we should call this DIDO, there will be no white flag above my door) will be AMAZING for social playlists.
However, there needs to be a reason why people won't quit out of ranked games as well, and that's where a visual rank plays a key role.
Well, even if it only penalized a rank only you could see, which is what they are talking about doing, people might take quitting a bit more seriously.
While I sort of liked the distinction of ranked and social, I'd rather all playlists be 'ranked' in some degree; just don't label it such. I think the label is more a source of stigma than anything.
Reach could have done this, but instead of making everything 'ranked' they made everything 'social' and then shoved 'ranked' into a corner with Arena.