Opt In and Out idea?

Please bear with me as I’m terrible at explaining things and ideas… such as this xD
I also apologize if this idea has been brought up already!

Wouldn’t it be a good idea to have an Opt In and Out option for each Playlist?

For example:
Let’s say I want to play Big Team Battle, but I don’t want to be put into a Halo 4 game(I like Halo 4. I’m just using it as an example).
I’ll just Opt Out of Halo 4 for Big Team Battle and leave Halo 1, 2, H2A and 3 Opted In.

Another example:
Let’s say I want to play Halo 2, but only Skirmish type games.
I’ll leave Skirmish Opted In and leave Slayers Opted Out.

I think this would be a great idea, so that way they don’t have to make a thousand different playlists for people.

Do you think this would create a conflict with ranks? Leading people to just Opt In or Out of what they’re really good or bad at?