I wish there was a community for some old style custom games, Halo 2 had by far the most custom variants of any game so far, and it's strange but I find zombies funner when it's not an actual gametype in H2 than it is in H3.
I actually play more MCC now than I did a few months ago. Halo 5 has made me want to play MCC more. H5 is so much harder than prior games. It makes all the other games seem easier for me. And I just played Action Sack for the first time ever this past weekend. LOVE that gametype. I'm spending more time playing MCC that H5.
Haven't played MCC since I started 5 but plan to go back to it eventually. Why not move MCC to dedicated servers like 5 to improve matchmaking? Sometimes I'll turn it off after a few minutes of no progress waiting on a multiplayer game to get set-up.