It would work in benefit of social game types like infection and anything unranked. It wouldn't work well playing ranked games. You should have to stay in the rank game and if someone quits they shouldn't be replaced because that is really not right.
I miss the custom playlist we had for infection in Halo 3.
I think they should bring a community infection playlist only from people's created forge maps.
They need to make infection more intense
Im praying that everyone one will be different. I mean if there is a massive amount of armor, colors. As of the secondary armor colors, i think you should be able change where it is placed and such.